Pre-assembly-free steel pipe truss arch parallel connection manufacturing process

Abstract

The invention relates to a pre-assembly-free steel pipe truss arch parallel connection manufacturing process. The manufacturing process is characterized by comprising the following specific manufacturing processes: S1, projection of steel pipe arch units; s2, arranging a jig frame; s3, steel pipe welding; s4, welding the joint plate; s5, steel pipe arch parallel connection manufacturing; by means of the manufacturing process, a large amount of site occupied by pre-assembly can be omitted, and the production operation efficiency is improved; the labor cost required by the assembly process and the disassembly after the assembly is completed is saved; the material cost required by pre-assembly is saved, the welding finishing cost is saved through welding deformation control, and the manufacturing precision of the steel pipe arch is improved; and a special jig frame structure and a special welding platform structure are adopted, so that the construction efficiency can be effectively improved.

Description

Technical Field

[0001] The invention relates to the technical field of bridge construction, and in particular to a pre-assembly-free steel tube truss arch flat joint manufacturing process. Background Art

[0002] Steel tube concrete arch bridges are widely used in bridge design because of their superior mechanical properties and aesthetics. In order to obtain the structural rigidity required for the arch ribs, most steel tube arch ribs adopt curved truss structures. In the processing of steel tube arches, most steel tube arch bridges use 2-3 meter sections of steel tubes to splice into arch units in a straight-instead-curved manner. They are generally made into 12 meter sections in the factory, and the joint plates and joint pipes are welded to the pipes. In order to ensure the accuracy of the production line, the factory often uses pre-assembly processing and production, which is bound to occupy a large amount of space, increase the cost of manual installation and dismantling, the cost of tooling materials and the construction period. Therefore, it is necessary to study a steel tube arch bridge manufacturing process that can control the line shape while avoiding pre-assembly, saving tooling materials, labor and construction period.

[0003] If pre-assembly is not performed, the manufacturing accuracy of the unit rods must be guaranteed to ensure the smooth assembly of the subsequent trusses and trusses; the steel tube unit rods are divided into extended main pipes, joint plates, joint pipes, etc., which are mainly controlled by their own curvature and the three-dimensional space accuracy composed of joint plates and joint pipes. Here, the three-dimensional space information is decomposed into two information: plane and height. The shape of the rod (including joint plates and joint pipes) is projected onto the construction platform to determine the plane shape control points; the tire frame is made according to the cross-sectional shape of the rod to determine the height control points; during the construction process, the shape of the rod can be accurately controlled by using the ground sample line and the shape of the tire frame as a reference. Because the arch rib main pipe itself has curvature, coupled with the welding node plate or joint pipe, it will cause welding deformation, and the steel pipe is strong and it is difficult to correct it by fire correction. Therefore, it is considered to add appropriate pre-camber before welding to offset the welding deformation and further improve the manufacturing accuracy. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a pre-assembly-free steel tube truss arch flat joint manufacturing process, which can solve the problem that the steel tube arch itself has curves and a truss structure, which requires a large amount of space for pre-assembly in the factory, increases the labor costs required for the assembly process and dismantling after assembly, the tooling material consumption costs, and the large amount of repair costs required for welding deformation after pre-assembly.

[0005] In order to solve the above technical problems, the technical solution of the present invention is: a pre-assembly-free steel tube truss arch flat joint manufacturing process, the innovation of which is: the specific manufacturing process is as follows: S1: Projection of steel tube arch unit: draw the projection line of the steel tube arch unit on the construction platform; S2: Tire frame arrangement: At the projection position of the S1 steel pipe arch unit on the construction platform, the tire frames are arranged on both sides of the steel pipe extension weld position and the joint plate position. The shape of the tire frames is consistent with the cross-section shape of the corresponding steel beam; S3: Steel pipe welding: Place the steel pipe on the tire frame in S2, and apply a reverse pre-camber of 2-10mm to the steel pipe at the welding position of the joint plate. After fixing the tire frame, steel pipe and construction platform, weld the butt welds between adjacent steel pipes; S4: Joint plate welding: After the steel pipe welding is completed, the joint plate is welded at the corresponding position on the side of the steel pipe, and then the constraint between the tire frame and the steel pipe is released, and the shape overlap between the steel pipe arch and the ground sample is checked to ensure that the error is within 2mm, and a steel pipe arch unit structure is obtained; S5: Steel tube arch flat joint manufacturing: S5.1: Preparation of multiple sets of steel tube arch units: Repeat steps S1 to S4 to obtain four steel tube arch units, namely, a lower inner steel tube arch unit, a lower outer steel tube arch unit, an upper inner steel tube arch unit and an upper outer steel tube arch unit; S5.2: Truss piece production: the lower inner steel tube arch unit and the lower outer steel tube arch unit are placed on two sets of tire frames respectively to form the outer contour of the lower steel tube arch truss piece structure; then the upper web plate is welded between the joint plate of the lower inner steel tube arch unit and the joint plate of the lower outer steel tube arch unit to form the lower steel tube arch truss piece structure; the upper inner steel tube arch unit and the upper outer steel tube arch unit are placed on two sets of tire frames respectively to form the outer contour of the upper steel tube arch truss piece structure; then the upper web plate is welded between the joint plate of the upper inner steel tube arch unit and the joint plate of the upper outer steel tube arch unit to form the upper steel tube arch truss piece structure; S5.3: Installation of parallel joint pipes: Use a welding platform to vertically weld and install parallel joint pipes above the lower steel pipe arch truss; S5.4: Forming of steel tube truss arch flat joint: hoist the upper steel tube arch truss piece structure above the lower steel tube arch truss piece and locate it on the top of the flat joint pipe, perform welding operation on the welding platform to weld the upper steel tube arch truss piece to the top of the flat joint pipe to realize the forming of the steel tube arch flat joint.

[0006] Furthermore, the tire frame includes a tire frame base and a plurality of support frames arranged above the tire frame base; The support frame includes a lifting frame, a lower clamp and an upper clamp, the lower clamp is fixed to the top of the lifting frame, the upper clamp is arranged above the lower clamp and is detachably connected to the lower clamp by a first bolt, a plurality of second bolts corresponding to each support frame are arranged on the top surface of the tire frame base, the lifting frame is rotatably sleeved on the outer side of the corresponding second bolt, and is relatively fixed to the second bolt by a second nut; The tire frame base includes a plurality of longitudinal I-beams parallel to each other, the longitudinal I-beams correspond to the second bolts one by one, the second bolts are fixedly connected to the middle of the top surface of the corresponding longitudinal I-beam, two transverse I-beams arranged in pairs and parallel to each other are arranged between two adjacent longitudinal I-beams, the transverse I-beams are perpendicular to the longitudinal I-beams, and the two ends of each transverse I-beam are fixedly connected to the end of the longitudinal I-beam on the same side; The lifting frame includes a bolt sleeve, a horizontal beam, and a plurality of vertical I-beams. The horizontal beam is arranged above the bolt sleeve through a diagonal brace and is perpendicular to the central axis of the bolt sleeve. The plurality of vertical I-beams are evenly fixed on the top surface of the horizontal beam and are perpendicular to the horizontal beam. The top ends of the plurality of vertical I-beams form an arc structure matching the shape of the lower hoop, and the lower hoop is fixed to the top ends of the vertical I-beams. A reinforcing arc rib is arranged on the outer side of the upper clamp, and the reinforcing arc rib is vertically fixedly connected to the middle part of the outer wall of the upper clamp.

[0007] Furthermore, a reinforcing I-beam is provided between the two paired transverse I-beams, the reinforcing I-beam is parallel to the transverse I-beam, and both ends of the reinforcing I-beam are connected to the connection between the longitudinal I-beam on the same side and the second bolt; the horizontal beam is formed by two parallel horizontal I-beams spliced ​​in parallel, and the middle web of the vertical I-beam is arranged along the splicing seam of the two horizontal I-beams.

[0008] Furthermore, the welding platform includes a frame-type construction platform, a bottom support structure and a ladder; The frame-type construction platform comprises a first frame and a second frame which are rotatably connected, the bottoms of the first frame and the second frame are respectively fixedly connected with a first construction platform and a second construction platform, and the outer sides of the first frame and the second frame are rotatably connected via a rotating structure; A semicircular groove is respectively provided on one side of the first frame and the second frame close to each other, and a semicircular groove is also respectively provided on one side of the first construction platform and the second construction platform close to each other. The first frame and the second frame are opened and closed by a rotating structure. After the first frame and the second frame are closed, the semicircular grooves are butted to form a circular groove corresponding to the outer peripheral shape of the steel tube truss arch flat joint pipe. At this time, the steel tube truss arch flat joint pipe is wrapped in the circular groove. After the first frame and the second frame are closed, they are locked by a locking structure; The bottom support structure is arranged at the bottom of the frame-type construction platform; The ladder is arranged obliquely on the front side of the bottom supporting structure and the frame-type construction platform; The bottom supporting structure and the ladder are supported by a bottom plate, and a plurality of pulleys are arranged at the bottom of the bottom plate.

[0009] Furthermore, the rotating structure includes a first mounting block, a second mounting block and a rotating shaft, the first mounting blocks are respectively installed on the upper and lower sides of the outer side of the first frame, the second mounting blocks are respectively installed on the upper and lower sides of the outer side of the second frame, the first mounting block and the second mounting block are respectively provided with a first through hole, and the first through holes on the first mounting block and the second mounting block are correspondingly arranged, and the rotating shaft is arranged vertically through the first through hole.

[0010] Furthermore, the locking structure includes a first locking block, a second locking block and a pin shaft, the first locking block is respectively installed on the upper and lower sides of one side of the first frame, the second locking block is respectively installed on the upper and lower sides of one side of the second frame, one side of the locking structure is installed and is arranged opposite to the side of the rotating structure, the first locking block and the second locking block are respectively provided with a second through hole, the second through holes on the first locking block and the second locking block are arranged correspondingly, and the pin shaft is arranged to pass through the second through hole transversely.

[0011] Furthermore, the bottom supporting structure includes an arc-shaped plate, a vertical plate and a support plate. The support plate is vertically fixed to the bottom of the first construction platform. Several support plates are arranged at intervals. A recessed area is provided at the lower side of the support plate close to the second construction platform. The vertical plate and the arc-shaped plate are arranged in the recessed area. The vertical plate is connected to the bottom of the arc-shaped plate, and the vertical plate and the arc-shaped plate connect and fix several support plates. A semicircular notch corresponding to the semicircular groove on the first construction platform is provided on the arc-shaped plate. The arc-shaped plate corresponds to the outer shape of the steel pipe connected to the flat connecting pipe.

[0012] The advantages of the present invention are: 1) The present invention utilizes this manufacturing process to avoid the need for a large amount of space occupied by pre-assembly, thereby improving production efficiency; saving labor costs required for the assembly process and dismantling after assembly; saving material costs required for pre-assembly, saving welding finishing costs through welding deformation control, and improving the manufacturing accuracy of steel pipe arches; and using a dedicated tire frame structure and welding platform structure, which can effectively improve construction efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0014] Figure 1 The present invention is a process flow chart of manufacturing a pre-assembly-free steel tube truss arch flat joint.

[0015] Figures 2 to 4 This is a manufacturing state diagram of a pre-assembly-free steel tube truss arch flat joint of the present invention Figures 5 to 7 This is a structural diagram of a pre-assembly-free steel tube truss arch flat joint manufacturing process according to the present invention.

[0016] Figures 8 to 10This is a structural diagram of a welding platform for a pre-assembly-free steel tube truss arch flat joint manufacturing process according to the present invention.

[0017] Fig.11 A structural diagram of a bridge manufactured using a pre-assembly-free steel tube truss arch flat joint manufacturing process according to the present invention. DETAILED DESCRIPTION

[0018] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0019] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0020] In this embodiment, for example, the steel beam structure of Jianyang Tuojiang Bridge is manufactured by the steel tube truss arch flat connection of the present invention; Fig.11 As shown, the steel main beam of the Tuojiang Bridge is an arch-beam combination section, which generally produces compression deformation along with the side arch; the arch rib is divided into three sections and assembled by bracket method, and the bridge deck is assembled by automobile suspension. The large segment arch rib is first assembled at the low position of the bridge deck, and then the hoisting bracket is lifted and closed as a whole; like Figures 1 to 10 A manufacturing process for pre-assembly-free steel tube truss arch flat joint is shown, and the specific manufacturing process is as follows: S1: Projection of steel tube arch unit: draw the projection line of the steel tube arch unit on the construction platform; S2: Tire frame arrangement: At the projection position of the S1 steel pipe arch unit on the construction platform, the tire frames are arranged on both sides of the steel pipe extension weld position and the joint plate position. The shape of the tire frames is consistent with the cross-section shape of the corresponding steel beam; S3: Steel pipe welding: Place the steel pipe on the tire frame in S2, and apply a reverse pre-camber of 2-10mm to the steel pipe at the welding position of the joint plate. After fixing the tire frame, steel pipe and construction platform, weld the butt welds between adjacent steel pipes; S4: Joint plate welding: After the steel pipe welding is completed, the joint plate is welded at the corresponding position on the side of the steel pipe, and then the constraint between the tire frame and the steel pipe is released, and the shape overlap between the steel pipe arch and the ground sample is checked to ensure that the error is within 2mm, and a steel pipe arch unit structure is obtained; S5: Steel tube arch flat joint manufacturing: S5.1: Fabrication of multiple groups of steel pipe arch units: Repeat the steps of S1 to S4 to fabricate four steel pipe arch units, namely the lower inner steel pipe arch unit, the lower outer steel pipe arch unit, the upper inner steel pipe arch unit, and the upper outer steel pipe arch unit; S5.2: Truss fabrication: Place the lower inner steel pipe arch unit and the lower outer steel pipe arch unit on two groups of jigs respectively to form the outer contour of the lower steel pipe arch truss structure; then weld the upper web between the joint plates of the lower inner steel pipe arch unit and the joint plates of the lower outer steel pipe arch unit to form the lower steel pipe arch truss structure; place the upper inner steel pipe arch unit and the upper outer steel pipe arch unit on two groups of jigs respectively to form the outer contour of the upper steel pipe arch truss structure; then weld the upper web between the joint plates of the upper inner steel pipe arch unit and the joint plates of the upper outer steel pipe arch unit to form the upper steel pipe arch truss structure; S5.3: Installation of horizontal bracing pipes: Vertically weld and install horizontal bracing pipes above the lower steel pipe arch truss using a welding platform; S5.4: Forming of the steel pipe arch horizontal bracing: Lift the upper steel pipe arch truss structure above the lower steel pipe arch truss and position it at the top of the horizontal bracing pipes, and perform welding operations on the welding platform to weld the upper steel pipe arch truss to the top of the horizontal bracing pipes to achieve the forming of the steel pipe arch horizontal bracing.

[0021] The jig includes a jig base 1 and two support frames 2 arranged above the jig base 1.

[0022] The jig base 1 includes two longitudinally arranged I-beams 11 that are parallel to each other. There are two pairs of laterally arranged I-beams 12 that are parallel to each other and are provided between adjacent longitudinally arranged I-beams 11. The laterally arranged I-beams 12 are perpendicular to the longitudinally arranged I-beams 11. The two ends of each laterally arranged I-beam 12 are welded and fixedly connected to the ends of the same-side longitudinally arranged I-beam 11. There is a reinforcing I-beam 13 provided between the two pairs of laterally arranged I-beams 12. The reinforcing I-beam 13 is parallel to the laterally arranged I-beams 12. The two ends of the reinforcing I-beam 13 are welded to the middle parts of the same-side longitudinally arranged I-beams 11. The longitudinally arranged I-beams 11, the laterally arranged I-beams 12, and the reinforcing I-beam 13 are spliced to form a "day" - shaped frame structure. On the top surface of the jig base 1, there are two second bolts 14 corresponding to each support frame. The second bolts 14 correspond to the longitudinally arranged I-beams 12 one by one. Each second bolt 14 is arranged at the splicing position of the corresponding longitudinally arranged I-beam and the reinforcing I-beam, and is welded and fixed vertically on the top surface of the corresponding longitudinally arranged I-beam 12 with its central axis vertical.

[0023] The support frame 2 includes a lifting frame, a lower clamp 25 and an upper clamp 26. The lifting frame includes a bolt sleeve 21, a horizontal beam 23, and five vertical I-beams 24. The bolt sleeve 21 is rotatably sleeved on the outside of the corresponding second bolt 21, and is relatively fixed with the second bolt 21 through the second nut 15. After the bolt sleeve 21 is sleeved on the outside of the second bolt 21, the second nut 15 is arranged above the bolt sleeve 21 and is threadedly connected with the second bolt 21. By tightening the second nut 15, the bolt sleeve 21 is relatively fixed with the second nut 15, thereby achieving relative fixation between the support frame 2 and the tire frame base 1. The horizontal beam 23 is formed by welding and splicing two parallel horizontal I-beams. The horizontal beam 23 is arranged above the bolt sleeve 21 through the diagonal brace 22 and is perpendicular to the central axis of the bolt sleeve 21. The diagonal brace 22 has two sides, which are respectively arranged on both sides of the bolt sleeve 21. The diagonal brace 22 is inclined from top to bottom in the direction close to the bolt sleeve 21. The bottom end of the diagonal brace 22 is welded and connected to the side wall of the bolt sleeve 21, and the top end is connected to the bottom surface of the horizontal beam 23. Five vertical I-beams 24 are evenly welded and fixed on the top surface of the horizontal beam 23 and are perpendicular to the horizontal beam 23. The middle web of the vertical I-beam 24 is arranged along the splicing seam of the two horizontal I-beams. The top ends of the five vertical I-beams 24 form an arc structure that matches the shape of the lower hoop 25. The lower hoop 25 is fixedly welded to the top of each vertical I-beam 24. The upper hoop 26 is arranged above the lower hoop and is detachably connected to the lower hoop 25 through the first bolt. A reinforcing arc rib 27 is provided on the outer side of the upper clamp 26 , and the reinforcing arc rib 27 is vertically welded to the middle part of the outer wall of the upper clamp 26 .

[0024] When assembling the steel tube arch, a corresponding number of tire frames are arranged on the ground or on the construction platform according to the length of the steel tube arch, and the angle of the support frame on each tire frame is adjusted so that the support frame on each tire frame is fixed according to the linear shape of the steel tube arch, and the short tube of the steel tube arch is placed on the lower clamping hoop of the tire frame, and the two ends of the same short tube are respectively supported by two support frames close to each other on two adjacent tire frames, and the joint of two adjacent short tubes is located between the two support frames of the same tire frame. After each short tube is placed in place, the upper clamping hoop of each tire frame is installed, and the first bolt is used to connect the upper clamping hoop and the lower clamping hoop to fix the steel tube arch to the entire tire frame, and then the butt joint of the steel tube arch is welded.

[0025] The upper clamp and the lower clamp of the tire frame used to fix the steel pipe are detachably connected, and a second bolt is arranged on the tire frame base, and the lifting frame at the bottom of the support frame is rotatably and movably sleeved on the outer side of the corresponding second bolt, so that the support frame can freely rotate horizontally on the tire frame base to realize linear adjustment, and after the linear adjustment, the linear fixation of the support frame is realized by tightening the second nut. The tire frame can avoid the need for tire frame modification and welding fixation, improve production operation efficiency, save the labor cost required for assembly and dismantling of traditional tire frames, save the cost of materials required for pre-assembly, avoid the welding fixation between the tire frame and the steel pipe, avoid the risk of damage to the parent material, and improve the production quality of the steel pipe arch.

[0026] The welding platform includes a frame-type construction platform 3, a bottom supporting structure 4 and a ladder 5.

[0027] The frame-type construction platform 3 includes a first frame 31 and a second frame 32 that are rotatably connected. The bottoms of the first frame 31 and the second frame 32 are fixedly connected with a first construction platform 33 and a second construction platform 34 respectively. The outer sides of the first frame 31 and the second frame 32 are rotatably connected via a rotating structure.

[0028] The rotating structure includes a first mounting block 35, a second mounting block 36 and a rotating shaft 37. The first mounting blocks 35 are respectively installed on the upper and lower sides of the outer side of the first frame 31, and the second mounting blocks 36 are respectively installed on the upper and lower sides of the outer side of the second frame 32. The first mounting block 35 and the second mounting block 36 are respectively provided with first through holes, and the first through holes on the first mounting block 35 and the second mounting block 36 are correspondingly arranged. The rotating shaft 37 is vertically arranged to pass through the first through hole. The rotation of the second frame 32 drives the second mounting block 36 to rotate around the rotating shaft 37.

[0029] A semicircular groove 38 is provided on one side of the first frame 31 and the second frame 32 close to each other, and a semicircular groove 38 is also provided on one side of the first construction platform 33 and the second construction platform 34 close to each other. The first frame 31 and the second frame 32 are opened and closed by a rotating structure. After the first frame 31 and the second frame 32 are closed, the semicircular grooves are connected to form a circular groove corresponding to the outer peripheral shape of the steel tube truss arch flat connecting pipe 30. At this time, the steel tube truss arch flat connecting pipe 30 is wrapped in the circular groove. After the first frame 31 and the second frame 32 are closed, they are locked by a locking structure.

[0030] The locking structure includes a first locking block 39, a second locking block 310 and a pin shaft. The first locking block 39 is respectively installed on the upper and lower sides of one side of the first frame 31, and the second locking block 310 is respectively installed on the upper and lower sides of one side of the second frame 32. One side of the locking structure is arranged opposite to the side of the rotating structure. The first locking block 39 and the second locking block 310 are respectively provided with a second through hole, and the second through holes on the first locking block 39 and the second locking block 310 are arranged correspondingly. The pin shaft is arranged to pass through the second through hole horizontally, and the first frame 31 and the second frame 32 are locked by the first locking block 39, the second locking block 310 and the pin shaft.

[0031] A rotating structure and a locking structure are provided between the first frame 31 and the second frame 32. When the frame-type construction platform 3 is in use, the first frame 31 and the second frame 32 are closed, and the first construction platform 33 and the second construction platform 34 are closed and fixed, so that the platform wraps the entire flat pipe 30. Workers carry out welding work on the platform. After the welding of the flat pipe 30 is completed, the first frame 31 and the second frame 32 can be opened.

[0032] The bottom support structure 4 is arranged at the bottom of the frame-type construction platform 3. The bottom support structure 4 includes an arc-shaped plate 41, a vertical plate 42 and a support plate 43. The support plate 43 is vertically fixed to the bottom of the first construction platform 33. Several support plates 43 are arranged at intervals. A recessed area is provided at the lower side of the support plate 43 close to the second construction platform 34. The vertical plate 42 and the arc-shaped plate 41 are arranged in the recessed area. The vertical plate 42 is connected to the bottom of the arc-shaped plate 41, and the vertical plate 42 and the arc-shaped plate 41 connect and fix several support plates 43. A semicircular notch corresponding to the semicircular groove on the first construction platform 33 is provided on the arc-shaped plate 41. The arc-shaped plate 41 corresponds to the outer shape of the steel pipe 40 connected to the flat connecting pipe 30.

[0033] The ladder 5 is obliquely arranged at the front side of the bottom supporting structure 4 and the frame-type construction platform 3 . The bottom supporting structure 4 and the ladder 5 are supported by a bottom plate 6 , and a plurality of pulleys are arranged at the bottom of the bottom plate 6 .

[0034] Working principle: When welding the steel tube truss arch flat-joined pipe 30, the steel tube truss is laid horizontally, the flat-joined pipe 30 is in a vertical state, the steel tube truss is supported by a tire frame, and the construction platform is moved to the welding position of the flat-joined pipe 30 by a pulley arranged at the bottom. The construction platform is easy to move, and a ladder 5 is arranged on the front side of the construction platform to facilitate workers to enter the construction platform. After the first frame 31 and the second frame 132 of the construction platform are closed and fixed so that the platform wraps the entire flat-joined pipe 30, the workers carry out welding work on the platform without stepping on the steel pipe 40 for welding. The welding operation is convenient and safe, and the construction quality can be guaranteed. This platform can provide sufficient construction platforms for welding workers, and the platform does not need to be moved frequently, thereby improving construction efficiency. The flat-joined pipe 30 can be opened after welding is completed to separate the platform from the steel tube truss, and the arc plate 41 of the bottom supporting structure 4 corresponds to the shape of the steel pipe 40, so that the arc plate 41 fits the steel pipe 40, and the construction platform can ride on the steel pipe 40 to ensure the stability of the platform.

[0035] Those skilled in the art should understand that the present invention is not limited to the above-mentioned embodiments. The above-mentioned embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may be subject to various changes and improvements, and these changes and improvements shall all fall within the scope of the present invention claimed for protection.

Claims

1. A pre-assembly-free steel tube truss arch flat joint manufacturing process, characterized in that: The specific manufacturing process is as follows: S1: Projection of steel tube arch unit: draw the projection line of the steel tube arch unit on the construction platform; S2: Tire frame arrangement: At the projection position of the S1 steel pipe arch unit on the construction platform, the tire frames are arranged on both sides of the steel pipe extension weld position and the joint plate position. The shape of the tire frames is consistent with the cross-section shape of the corresponding steel beam; S3: Steel pipe welding: Place the steel pipe on the tire frame in S2, and apply a reverse pre-camber of 2-10mm to the steel pipe at the welding position of the joint plate. After fixing the tire frame, steel pipe and construction platform, weld the butt welds between adjacent steel pipes; S4: Joint plate welding: After the steel pipe welding is completed, the joint plate is welded at the corresponding position on the side of the steel pipe, and then the constraint between the tire frame and the steel pipe is released, and the shape overlap between the steel pipe arch and the ground sample is checked to ensure that the error is within 2mm, and a steel pipe arch unit structure is obtained; S5: Steel tube arch flat joint manufacturing: S5.1: Preparation of multiple sets of steel tube arch units: Repeat steps S1 to S4 to obtain four steel tube arch units, namely, a lower inner steel tube arch unit, a lower outer steel tube arch unit, an upper inner steel tube arch unit and an upper outer steel tube arch unit; S5.2: Truss piece production: the lower inner steel tube arch unit and the lower outer steel tube arch unit are placed on two sets of tire frames respectively to form the outer contour of the lower steel tube arch truss piece structure; then the upper web plate is welded between the joint plate of the lower inner steel tube arch unit and the joint plate of the lower outer steel tube arch unit to form the lower steel tube arch truss piece structure; the upper inner steel tube arch unit and the upper outer steel tube arch unit are placed on two sets of tire frames respectively to form the outer contour of the upper steel tube arch truss piece structure; then the upper web plate is welded between the joint plate of the upper inner steel tube arch unit and the joint plate of the upper outer steel tube arch unit to form the upper steel tube arch truss piece structure; S5.3: Installation of parallel joint pipes: Use a welding platform to vertically weld and install parallel joint pipes above the lower steel pipe arch truss; S5.4: Forming of steel tube truss arch flat joint: hoist the upper steel tube arch truss piece structure above the lower steel tube arch truss piece and locate it on the top of the flat joint pipe, perform welding operation on the welding platform to weld the upper steel tube arch truss piece to the top of the flat joint pipe to realize the forming of the steel tube arch flat joint.

2. The manufacturing process for pre-assembly-free steel tube truss arch parallel connection according to claim 1, characterized in that: The tire frame includes a tire frame base and a plurality of support frames arranged above the tire frame base; The support frame includes a lifting frame, a lower clamp and an upper clamp, the lower clamp is fixed to the top of the lifting frame, the upper clamp is arranged above the lower clamp and is detachably connected to the lower clamp by a first bolt, a plurality of second bolts corresponding to each support frame are arranged on the top surface of the tire frame base, the lifting frame is rotatably sleeved on the outer side of the corresponding second bolt, and is relatively fixed to the second bolt by a second nut; The tire frame base includes a plurality of longitudinal I-beams parallel to each other, the longitudinal I-beams correspond to the second bolts one by one, the second bolts are fixedly connected to the middle of the top surface of the corresponding longitudinal I-beam, two transverse I-beams arranged in pairs and parallel to each other are arranged between two adjacent longitudinal I-beams, the transverse I-beams are perpendicular to the longitudinal I-beams, and the two ends of each transverse I-beam are fixedly connected to the end of the longitudinal I-beam on the same side; The lifting frame includes a bolt sleeve, a horizontal beam, and a plurality of vertical I-beams. The horizontal beam is arranged above the bolt sleeve through a diagonal brace and is perpendicular to the central axis of the bolt sleeve. The plurality of vertical I-beams are evenly fixed on the top surface of the horizontal beam and are perpendicular to the horizontal beam. The top ends of the plurality of vertical I-beams form an arc structure matching the shape of the lower hoop, and the lower hoop is fixed to the top ends of the vertical I-beams. A reinforcing arc rib is arranged on the outer side of the upper clamp, and the reinforcing arc rib is vertically fixedly connected to the middle part of the outer wall of the upper clamp.

3. The manufacturing process for pre-assembly-free steel tube truss arch parallel connection according to claim 2, characterized in that: A reinforcing I-beam is provided between the two paired transverse I-beams. The reinforcing I-beam is parallel to the transverse I-beam, and both ends of the reinforcing I-beam are connected to the connection between the longitudinal I-beam on the same side and the second bolt; the horizontal beam is formed by two parallel horizontal I-beams spliced ​​in parallel, and the middle web of the vertical I-beam is arranged along the splicing seam of the two horizontal I-beams.

4. The manufacturing process for pre-assembly-free steel tube truss arch parallel connection according to claim 1, characterized in that: The welding platform includes a frame-type construction platform, a bottom support structure and a ladder; The frame-type construction platform comprises a first frame and a second frame which are rotatably connected, the bottoms of the first frame and the second frame are respectively fixedly connected with a first construction platform and a second construction platform, and the outer sides of the first frame and the second frame are rotatably connected via a rotating structure; A semicircular groove is respectively provided on one side of the first frame and the second frame close to each other, and a semicircular groove is also respectively provided on one side of the first construction platform and the second construction platform close to each other. The first frame and the second frame are opened and closed by a rotating structure. After the first frame and the second frame are closed, the semicircular grooves are butted to form a circular groove corresponding to the outer peripheral shape of the steel tube truss arch flat joint pipe. At this time, the steel tube truss arch flat joint pipe is wrapped in the circular groove. After the first frame and the second frame are closed, they are locked by a locking structure; The bottom support structure is arranged at the bottom of the frame-type construction platform; The ladder is arranged obliquely on the front side of the bottom supporting structure and the frame-type construction platform; The bottom supporting structure and the ladder are supported by a bottom plate, and a plurality of pulleys are arranged at the bottom of the bottom plate.

5. The manufacturing process for pre-assembly-free steel tube truss arch parallel connection according to claim 4 is characterized in that: The rotating structure includes a first mounting block, a second mounting block and a rotating shaft. The first mounting blocks are respectively installed on the upper and lower sides of the outer side of the first frame, and the second mounting blocks are respectively installed on the upper and lower sides of the outer side of the second frame. The first mounting block and the second mounting block are respectively provided with first through holes, and the first through holes on the first mounting block and the second mounting block are correspondingly arranged, and the rotating shaft is arranged vertically through the first through holes.

6. The manufacturing process for pre-assembly-free steel tube truss arch parallel connection according to claim 4, characterized in that: The locking structure includes a first locking block, a second locking block and a pin shaft. The first locking blocks are respectively installed on the upper and lower sides of one side of the first frame, and the second locking blocks are respectively installed on the upper and lower sides of one side of the second frame. One side where the locking structure is installed is arranged opposite to the side where the rotating structure is installed. The first locking block and the second locking block are respectively provided with second through holes, and the second through holes on the first locking block and the second locking block are arranged correspondingly, and the pin shaft is arranged to pass through the second through holes transversely.

7. The manufacturing process for pre-assembly-free steel tube truss arch parallel connection according to claim 4, characterized in that: The bottom supporting structure includes an arc-shaped plate, a vertical plate and a support plate. The support plate is vertically fixed to the bottom of the first construction platform. Several support plates are arranged at intervals. A recessed area is provided below the side of the support plate close to the second construction platform. The vertical plate and the arc-shaped plate are arranged in the recessed area. The vertical plate is connected to the bottom of the arc-shaped plate, and the vertical plate and the arc-shaped plate connect and fix several support plates. A semicircular notch corresponding to the semicircular groove on the first construction platform is provided on the arc-shaped plate. The arc-shaped plate corresponds to the outer shape of the steel pipe connected to the flat connecting pipe.

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