A steel bridge U-shaped rib lining assembly welding tool and assembly welding method

Abstract

This invention discloses a welding fixture and method for assembling U-shaped rib liners for steel bridges. The welding fixture includes a base plate, support plates, a first guide block, a cam, and a first clamping rod. Support plates are fixed on both sides of the base plate, and several first guide blocks are fixed between the support plates. The first clamping rod is inserted into a through hole on the first guide block and can move along the through hole. The cam is installed between the center of the support plates and can perform circumferential motion within the cavity formed between the support plates. When the distal end of the cam rotates to contact the inner end of the first clamping rod, the cam pushes the first clamping rod to move outward along the through hole on the first guide block to clamp the liner, so that the liner is tightly attached to the root of the butt weld of the U-shaped rib. This welding fixture, with the help of a disc cam, clamps the steel liner to the U-shaped rib and performs positioning welding by rotating the disc cam at different positions, effectively controlling the assembly gap between the U-shaped rib and the steel liner, providing conditions for subsequent welding, and improving the fatigue resistance of the weld.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of welding of bridge deck unit U-shaped ribs, and particularly relates to a steel bridge U-shaped rib gasket assembly welding tool and assembly welding method. BACKGROUND

[0002] The existing steel box girder bridge deck is welded by a bridge deck and a U-shaped rib, and the U-shaped rib is connected by welding or high-strength bolts at the bridge site. When welding, a steel gasket is attached to the root of the weld. Because only single-sided welding can be performed on site, the back of the gasket is attached to complete the butt welding on the bevel. However, the U-shaped gasket cannot be well fitted to the U-shaped rib during assembly, and assembly gaps exist universally, especially at the arc portion. The existence of the assembly gap greatly reduces the fatigue strength of the detail. Therefore, high-strength bolt connections are used in many domestic large projects to ensure the fatigue resistance of the connection portion. However, the manufacturing process of the high-strength bolt connection is complex, the on-site operation is difficult, and the construction cost is high. SUMMARY

[0003] In order to solve the above problems existing in the prior art, the present application provides a steel bridge U-shaped rib gasket assembly welding tool and assembly welding method. The technical problem to be solved by the present application is solved by the following technical scheme:

[0004] A steel bridge U-shaped rib gasket assembly welding tool, comprising: a bottom plate, a support plate, a first guide block, a cam, and a first tightening rod; wherein,

[0005] The support plates are fixed on both sides of the bottom plate, a plurality of first guide blocks are fixed between the support plates, and the first tightening rod is inserted into the through hole of the first guide block and can move along the through hole. The cam is installed between the central portions of the support plates and can make circular motion in the cavity formed between the support plates. When the distal end of the cam rotates to contact the inner end of the first tightening rod, the cam pushes the first tightening rod to move outward along the through hole of the first guide block to tighten the gasket, so that the gasket tightly adheres to the root of the U-shaped rib butt weld.

[0006] Further, at least five first guide blocks are fixed between the support plates, wherein two first guide blocks are fixed horizontally between the central portions of the support plates, one first guide block is fixed between the top rounded corners of the support plates, one first guide block is fixed between the central portions of the top of the support plates, and the inner ends of the first guide blocks are distributed at the periphery of the cam.

[0007] Further, a double connecting rod, a second guide block and a second tightening rod are further included; the second guide block is fixed at both ends of the bottom plate, the second tightening rod is inserted into and movable along the through hole on the second guide block; the two ends of the double connecting rod are respectively hinged to the inner ends of the second tightening rod, and the middle hinge point of the double connecting rod is higher than the two end hinge points in the initial position; when the distal end of the cam rotates to contact the middle hinge point of the double connecting rod, the middle hinge point of the double connecting rod is pushed to move downward, and then the two end hinge points of the double connecting rod push the second tightening rod to move outward along the through hole on the second guide block respectively to tighten the gasket, so that the gasket is tightly attached to the root of the butt weld of the U-shaped rib.

[0008] Further, the first tightening rod includes a fixed plate, a fixed rod vertically fixed at the outer end of the fixed plate and a clamping plate vertically fixed at the inner end of the fixed plate; the outer end of the fixed rod is provided with a stop ring, the clamping plate is provided with a roller, and the fixed rod is inserted into the through hole on the first guide block and is limited by the stop ring.

[0009] The application further provides a method for assembling and welding a gasket for a U-shaped rib of a steel bridge by using the assembling and welding tool for the gasket of the U-shaped rib of the steel bridge.

[0010] Step 1: bend and form the gasket to adapt to the shape of the box opening formed by the bridge deck and the U-shaped rib, place the bent and formed gasket in the box opening, and then place the assembling and welding tool in the bent and formed gasket and adjust the assembling and welding tool to the initial state.

[0011] Step 2: rotate the cam to the vertical downward position, push the top of the double connecting rod downward by the distal end of the cam, move the two ends of the double connecting rod outward, and then push the second tightening rod outward to tighten the two ends of the gasket, so that the gasket is tightly attached to the root of the butt weld of the U-shaped rib, position the two ends of the gasket, and perform positioning welding on the left end of the gasket.

[0012] Step 3: rotate the cam clockwise to the left middle part of the support plate, push the first tightening rod outward to tighten the left middle part of the gasket by the distal end of the cam, so that the left middle part of the gasket is tightly attached to the root of the butt weld of the U-shaped rib, position the left middle part of the gasket, and perform positioning welding on the left middle part of the gasket.

[0013] Step 4: continue to rotate the cam clockwise to the left upper corner of the support plate, push the first tightening rod outward to tighten the left upper corner of the gasket by the distal end of the cam, so that the left upper corner of the gasket is tightly attached to the root of the butt weld of the U-shaped rib, position the left upper corner of the gasket, and perform positioning welding on the left upper corner of the gasket.

[0014] Step 5: continue to rotate the cam clockwise to the vertical upward position, so that the cam distal end pushes the first tightening rod to move the top center of the gasket outward, so that the top center of the gasket is tightly attached to the root of the U-shaped rib butt weld, the top center of the gasket is positioned, and the top center of the gasket is positioned and welded;

[0015] Step 6: continue to rotate the cam clockwise to the position of the upper right corner of the support plate, so that the cam distal end pushes the first tightening rod to move the upper right corner of the gasket outward, so that the upper right corner of the gasket is tightly attached to the root of the U-shaped rib butt weld, the upper right corner of the gasket is positioned, and the upper right corner of the gasket is positioned and welded;

[0016] Step 7: continue to rotate the cam clockwise to the position of the right middle of the support plate, so that the cam distal end pushes the first tightening rod to move the right middle of the gasket outward, so that the right middle of the gasket is tightly attached to the root of the U-shaped rib butt weld, the right middle of the gasket is positioned, and the right middle of the gasket is positioned and welded;

[0017] Step 8: continue to rotate the cam clockwise to the vertical downward position, so that the cam distal end pushes the top of the double connecting rod to move downward, so that the two ends of the double connecting rod move outward, and then pushes the second tightening rod to move the two ends of the gasket outward, so that the gasket is tightly attached to the root of the U-shaped rib butt weld, the two ends of the gasket are positioned, and the right end of the gasket is positioned and welded.

[0018] Advantages of the present application:

[0019] 1. The assembly welding tool uses a disc-shaped cam to rotate at different positions to position and weld the steel gasket and the U-shaped rib after being tightened, effectively controls the assembly gap between the U-shaped rib and the steel gasket, provides conditions for subsequent welding, and improves the fatigue resistance of the weld;

[0020] 2. The assembly welding tool has good tightening effect, avoids the problem of large assembly gap in traditional assembly welding method, and has small on-site operation difficulty and small construction cost.

[0021] The present application will be further described in detail below in combination with the drawings and examples. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 is a structural schematic diagram of the present application;

[0023] Figure 2 is a structural schematic diagram of the present application;

[0024] Figure 3 is a structural schematic diagram of the present application;

[0025] Figures 4 to 11 is a step schematic diagram of the assembly welding method in Example 2.

[0026] BRIEF DESCRIPTION OF DRAWINGS

[0027] 1-base plate; 2-supporting plate; 3-first guide block; 4-first tightening rod; 5-cam; 6-steel liner; 7-U-shaped rib; 8-double connecting rod; 9-second guide block; 10-second tightening rod; 4-1-fixing plate; 4-2-fixing rod; 4-3-clamping plate; 4-4-stop ring; 4-5-roller. DETAILED DESCRIPTION

[0028] The application will be further described in detail below with specific examples, but the embodiments of the application are not limited thereto.

[0029] Example 1

[0030] Please also see Figures 1 to 3 The steel bridge U-shaped rib liner assembly welding tool provided by the embodiment of the application specifically comprises a base plate 1, two supporting plates 2, a first guide block 3, a first tightening rod 4 and a cam 5.

[0031] The two sides of the base plate 1 are respectively fixed with the supporting plates 2, the supporting plates 2 are fixed with the first guide blocks 3, the first tightening rod 4 is inserted into the through hole on the first guide block 3 and can move along the through hole, the cam 5 is installed between the central supporting plates 2 and can make circular motion in the cavity formed between the supporting plates 2, and when the distal end of the cam 5 rotates to contact the inner end of the first tightening rod 4, the cam 5 pushes the first tightening rod 4 to move outward along the through hole on the first guide block 3 to tighten the steel liner 6, so that the steel liner 6 is tightly attached to the root of the butt weld of the U-shaped rib 7; wherein the cam 5 is a disc-shaped cam 5.

[0032] Further, five first guide blocks 3 are fixed between the supporting plates 2, wherein two first guide blocks 3 are horizontally fixed between the central supporting plates 2, one first guide block 3 is respectively fixed between the top round corners of the supporting plates 2, and one first guide block 3 is fixed between the central top of the supporting plates 2, and the inner ends of the first guide blocks 3 are distributed at the periphery of the cam 5.

[0033] Specifically, the first tightening rod 4 comprises a fixing plate 4-1, a fixing rod 4-2 vertically fixed at the outer end of the fixing plate 4-1, and a clamping plate 4-3 vertically fixed at the inner end of the fixing plate 4-1, the outer end of the fixing rod 4-2 is provided with a stop ring 4-4, the rollers 4-5 are installed between the clamping plates 4-3, and the fixing rod 4-2 is inserted into the through hole on the first guide block 3 from inside to outside and is limited by the stop ring 4-4.

[0034] Further, the group welding tool further comprises a double connecting rod 8, a second guide block 9 and a second pressing rod 10; the second guide block 9 is welded at both ends of the bottom plate 1 and is provided with a through hole in the middle, the second pressing rod 10 is inserted into the through hole and can move along the through hole; the two ends of the double connecting rod 8 are respectively hinged to the inner ends of the second pressing rod 10, and the middle hinge point of the double connecting rod 8 is higher than the two end hinge points in the initial position; when the distal end of the cam 5 rotates to contact the middle hinge point of the double connecting rod 8, the middle hinge point of the double connecting rod 8 is pushed to move downward, and then the two end hinge points of the double connecting rod 8 push the second pressing rod 10 to move outward along the through hole in the second guide block 9 respectively to press the steel lining 6, so that the steel lining 6 is tightly attached to the root of the butt weld of the U-shaped rib 7.

[0035] In order to reduce the weight of the whole group welding tool, holes can be opened on the left and right sides of the supporting plate without affecting the use, so that the rotation direction of the cam can be monitored while the weight is reduced, thereby facilitating positioning welding at the appropriate time.

[0036] The steel lining is positioned and welded by pressing the steel lining and the U-shaped rib at different positions through the rotation of the cam, the assembly gap between the U-shaped rib and the steel lining is reduced through pressing, which provides conditions for subsequent welding and improves the fatigue resistance of the weld.

[0037] Embodiment 2

[0038] The embodiment of the present application provides a group welding method for a steel bridge U-shaped rib lining, which is realized by using the group welding tool of embodiment 1, please refer to Figures 4 to 11 , which specifically comprises the following steps:

[0039] Step 1: press and bend the steel lining to make its shape adapt to the box opening shape formed by the bridge deck and the U-shaped rib, place the press-bent lining in the box opening, and then place the group welding tool into the press-bent steel lining to preliminarily position in the cavity formed by the bridge deck, and adjust the group welding tool to the initial state, as shown in Figure 4 .

[0040] Step 2: rotate the cam to the vertical downward position, push the top of the double connecting rod downward by the distal end of the cam, move the two ends of the double connecting rod outward, and then push the second pressing rod outward to press the two ends of the steel lining, realize the center positioning of the group welding tool in the U-shaped rib, and tightly attach the lower part of the steel lining to the root of the butt weld of the U-shaped rib, position the two ends of the steel lining, and perform positioning welding on the left end of the steel lining, as shown in Figure 5 .

[0041] Step 3: Continue to rotate the cam clockwise to the left middle of the support plate, so that the distal end of the cam pushes the first tightening rod to move the left middle of the steel gasket outward, so that the left middle of the steel gasket is tightly attached to the root of the butt weld of the U-shaped rib, and the left middle of the steel gasket is positioned and tack welded, as shown in Figure 6 ;

[0042] Step 4: Continue to rotate the cam clockwise to the upper left corner of the support plate, so that the distal end of the cam pushes the first tightening rod to move the upper left corner of the steel gasket outward, so that the upper left corner of the steel gasket is tightly attached to the root of the butt weld of the U-shaped rib, and the upper left corner of the steel gasket is positioned and tack welded, as shown in Figure 7 ;

[0043] Step 5: Continue to rotate the cam to the vertical upward position, i.e. the top of the support plate, so that the distal end of the cam pushes the first tightening rod to move the top center of the steel gasket outward, so that the top center of the steel gasket is tightly attached to the root of the butt weld of the U-shaped rib, and the top center of the steel gasket is positioned and tack welded, as shown in Figure 8 ;

[0044] Step 6: Continue to rotate the cam clockwise to the upper right corner of the support plate, so that the distal end of the cam pushes the first tightening rod to move the upper right corner of the steel gasket outward, so that the upper right corner of the steel gasket is tightly attached to the root of the butt weld of the U-shaped rib, and the upper right corner of the steel gasket is positioned and tack welded, as shown in Figure 9 ;

[0045] Step 7: Continue to rotate the cam clockwise to the right middle of the support plate, so that the distal end of the cam pushes the first tightening rod to move the right middle of the steel gasket outward, so that the right middle of the steel gasket is tightly attached to the root of the butt weld of the U-shaped rib, and the right middle of the steel gasket is positioned and tack welded, as shown in Figure 10 ;

[0046] Step 8: Continue to rotate the cam clockwise to the vertical downward position, so that the distal end of the cam pushes the top of the double connecting rod downward, so that the two ends of the double connecting rod move outward, and then pushes the second tightening rod to move the two ends of the steel gasket outward, so that the steel gasket is tightly attached to the root of the butt weld of the U-shaped rib, and the two ends of the steel gasket are positioned and tack welded, as shown in Figure 11 ;

[0047] Step 9: Move the assembly tool out, and complete the positioning and assembly of the steel gasket.

[0048] In the description of the application, the terms "first", "second", are only used for descriptive purposes and are not to be construed as indicating or implying relative importance or an indicated number of technical features. Thus, the features defined with "first", "second" can explicitly or implicitly include one or more of the features.

[0049] The above is a further detailed description of the application in conjunction with specific preferred embodiments, and cannot be deemed to limit the specific implementation of the application to these descriptions. For ordinary skilled persons in the art to which the application belongs, without departing from the concept of the application, a number of simple deductions or substitutions can be made, which should be regarded as falling within the protection scope of the application.

Claims

1. A method of group welding of U-rib bridge girders, characterized in that: The group welding tool comprises a bottom plate, support plates, first guide blocks, a cam and first tightening rods, wherein the support plates are fixed on both sides of the bottom plate, the first guide blocks are fixed between the support plates, the first tightening rods are inserted into the through holes of the first guide blocks and can move along the through holes, and the cam is installed between the central portions of the support plates and can make circular motion in the cavity formed between the support plates; when the distal end of the cam rotates to contact the inner end of the first tightening rod, the cam pushes the first tightening rod to move outward along the through hole of the first guide block to tightly press the gasket, so that the gasket is tightly attached to the root of the U-shaped rib butt weld; The group welding tool further comprises double connecting rods, second guide blocks and second tightening rods; the second guide blocks are fixed on both ends of the bottom plate, the second tightening rods are inserted into the through holes of the second guide blocks and can move along the through holes, and the two ends of the double connecting rods are hingedly connected to the inner ends of the second tightening rods; when the cam distal end rotates to contact the hinged point of the middle portion of the double connecting rod, the cam pushes the hinged point of the middle portion of the double connecting rod to move downward, and then pushes the two ends of the double connecting rod to move outward along the through holes of the second guide blocks to tightly press the gasket, so that the gasket is tightly attached to the root of the U-shaped rib butt weld; The group welding method is performed by using the group welding tool and comprises the following steps: Step 1: bend the gasket to make its shape adapt to the box opening shape formed by the bridge deck and the U-shaped rib, place the bent gasket in the box opening, and then place the group welding tool in the bent gasket and adjust the group welding tool to the initial state; Step 2: rotate the cam to the vertical downward position, so that the distal end of the cam pushes the top of the double connecting rod to move downward, the two ends of the double connecting rod move outward, the second tightening rods move outward to tightly press the two ends of the gasket, the gasket is tightly attached to the root of the U-shaped rib butt weld, the two ends of the gasket are positioned, and the left end of the gasket is positioned and welded; Step 3: rotate the cam clockwise to the left middle portion of the support plate, so that the distal end of the cam pushes the first tightening rod to move outward to tightly press the left middle portion of the gasket, the left middle portion of the gasket is tightly attached to the root of the U-shaped rib butt weld, the left middle portion of the gasket is positioned, and the left middle portion of the gasket is positioned and welded; Step 4: continue to rotate the cam clockwise to the left upper corner of the support plate, so that the distal end of the cam pushes the first tightening rod to move outward to tightly press the left upper corner of the gasket, the left upper corner of the gasket is tightly attached to the root of the U-shaped rib butt weld, the left upper corner of the gasket is positioned, and the left upper corner of the gasket is positioned and welded; Step 5: continue to rotate the cam clockwise to the vertical upward position, so that the distal end of the cam pushes the first tightening rod to move outward to tightly press the central portion of the top of the gasket, the central portion of the top of the gasket is tightly attached to the root of the U-shaped rib butt weld, the central portion of the top of the gasket is positioned, and the central portion of the top of the gasket is positioned and welded; Step 6: Continue to rotate the cam clockwise to the position of the right upper corner of the support plate, so that the distal end of the cam pushes the first tightening rod to move the tightening pad outward to the right upper corner, so that the right upper corner of the pad is tightly attached to the root of the butt weld of the U-shaped rib, the right upper corner of the pad is positioned, and the right upper corner of the pad is positioned and welded; Step 7: Continue to rotate the cam clockwise to the position of the right middle of the support plate, so that the distal end of the cam pushes the first tightening rod to move the tightening pad outward to the right middle, so that the right middle of the pad is tightly attached to the root of the butt weld of the U-shaped rib, the right middle of the pad is positioned, and the right middle of the pad is positioned and welded; Step 8: Continue to rotate the cam clockwise to the position of vertical downward, so that the distal end of the cam pushes the double connecting rod top to move downward, so that the double connecting rod moves outward at both ends, and then pushes the second tightening rod to move the tightening pad outward at both ends, so that the pad is tightly attached to the root of the butt weld of the U-shaped rib, the both ends of the pad are positioned, and the right end of the pad is positioned and welded.

2. The method of claim 1, wherein, At least five first guide blocks are fixed between the support plates, wherein two first guide blocks are fixed horizontally between the middle of the support plates, one first guide block is fixed between the top round corners of the support plates respectively, one first guide block is fixed between the central top of the support plates, and the inner ends of the first guide blocks are distributed at intervals around the cam.

3. The method of claim 1, wherein, The first tightening rod comprises a fixed plate, a fixed rod vertically fixed at the outer end of the fixed plate, and a clamping plate vertically fixed at the inner end of the fixed plate; the outer end of the fixed rod is provided with a stop ring, the clamping plates are provided with rollers, the fixed rod is inserted into the through hole of the first guide block and is limited by the stop ring.

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