Movable welding operation platform for steel box girder bottom plate

Abstract

A movable welding operation platform for a steel box girder bottom plate comprises a top beam, a side beam and a cantilever operation platform, the upper end of the side beam is fixedly welded to one end of the top beam, the lower end of the side beam is fixedly welded to one end of the cantilever operation platform, and the side beam, the top beam and the cantilever operation platform are connected to form a C-shaped structure. The bottom of the top beam is provided with walking wheels used for walking on a steel box beam face in the longitudinal bridge direction, the top face, away from the side beam end, of the top beam is provided with a weight box, the top beam comprises two parallel main beams, a plurality of trusses are connected between the two main beams at intervals, the side beam comprises two left vertical rods and two right vertical rods, and the two vertical rods are connected with the two trusses at intervals. The two vertical rods on the left side and the two vertical rods on the right side are correspondingly connected with the main beam on the left side and the main beam on the right side of the top beam, and a plurality of horizontal truss rods are connected between the two vertical rods on the left side, between the two vertical rods on the right side and between the vertical rods on the left side and the vertical rods on the right side at the ends respectively. The welding operation platform is good in structural property, capable of moving on the steel box girder and low in construction cost.

Description

Technical Field

[0001] The utility model relates to the technical field of steel box girder construction, in particular to a movable welding operation platform for a bottom plate of a steel box girder. Background Art

[0002] With the continuous development of highway construction, prefabricated beams are widely used in the construction of bridge superstructures, and steel box beams are also widely used in interchange hub projects. Steel box beams are also called steel plate box beams. Steel box beams are a common structural form for large-span bridges. They are generally used on bridges with larger spans. Because they look like a box, they are called steel box beams. Steel box beams are generally connected by a full welding method, including top plate, bottom plate, web plate, diaphragm, longitudinal diaphragm and stiffening ribs. In bridge steel structures, due to the requirements of use function and bearing capacity, more and more steel box bridges are developing in the direction of large spans and large cross-sections. Considering the performance of hoisting equipment and construction cost, steel box bridges are generally divided into sections and manufactured in factories, and then transported to the construction site for assembly and welding. The welding of the bottom plate butt welds of steel box beams and the connection between the transverse stiffening ribs and the webs needs to be completed under the steel box beam. In the past, most of them were carried out by erecting brackets, special manned cranes or introducing bridge inspection machines, which had the limitations of high cost, high terrain conditions and poor flexibility. Summary of the invention

[0003] The utility model aims to provide a movable welding work platform for the bottom plate of a steel box beam. The movable welding work platform for the bottom plate of a steel box beam has good structure, can be moved on the steel box beam, and extends from the side of the steel box beam to the bottom of the steel box beam as a welding work platform for the bottom plate of the steel box beam, and has low construction cost.

[0004] In order to achieve the purpose of the utility model, the technical solution adopted is:

[0005] A movable welding work platform for the bottom plate of a steel box beam comprises a top beam, a side beam and a cantilever work platform. The upper end of the side beam is welded and fixed to one end of the top beam, and the lower end of the side beam is welded and fixed to one end of the cantilever work platform. The side beam is connected to the top beam and the cantilever work platform to form a C-shaped structure. The bottom of the top beam is equipped with a walking wheel for walking in the longitudinal direction of the steel box beam surface. A counterweight box is arranged on the top surface of the top beam away from the side beam end. The top beam comprises two parallel main beams. A plurality of trusses are connected between the two main beams at intervals. The top beam is a suspension force-bearing structure. The rods include a truss composed of channel steel and angle steel, which is composed of two channel steels as main beams, 3m long and 80cm apart. Angle steel is used as a truss for horizontal connection between the two main beams, with a spacing of 80cm. The top beam is located on the top plate of the steel box beam; the side beams include two left vertical bars and two right vertical bars, which are connected to the main beams on the left and right of the top beam respectively. Multiple horizontal trusses are connected between the two left vertical bars, the two right vertical bars, and the left and right vertical bars at the ends. The side beams are connected to the top beam and the cantilever work platform by four vertical bars, which are more firmly connected and more stable to install and use. That is, the side beams are composed of four channel steel vertical bars, 4m long, arranged in double rows, with a spacing of 80cm within the row and 60cm between the rows. Φ8 steel bars are used as horizontal trusses on the outside to connect the vertical bars in pairs, with a spacing of 30cm, and are used as step ladders for people to go up and down synchronously.

[0006] Further preferred: a movable door is provided on the top of the counterweight box to facilitate the placement of the counterweight. The counterweight box is an important component of the structural force, and is welded with 3mm thick steel plates to form a 0.8m×0.8m×0.8m box body, which is welded and fixed to the top beam. A movable door is provided on the top of the box body for placing the counterweight.

[0007] Further preferably, the number of the traveling wheels is four rubber wheels with braking function, which are installed symmetrically at the bottom of the two main beams, so that the structure can be moved as a whole under human push or other traction force.

[0008] Further preferably, the cantilever work platform is surrounded by a guardrail formed by welding Φ8 steel bars and arranged on the free surface of the outer edge of the cantilever work platform.

[0009] Further preferred: the cantilever work platform is connected to the side beam with an inclined brace as an auxiliary force-bearing member of the cantilever work platform. The inclined brace is an auxiliary force-bearing member of the cantilever work platform to reduce the maximum deflection and stress of the cantilever work platform. Two channel steels are used to obliquely connect the side beam and the cantilever work platform. The angle between the inclined brace and the horizontal is 30°, the upper end is connected to the side beam, and the lower end is connected to the main beam of the cantilever work platform.

[0010] Further preferred: the two sides of the cantilever work platform away from the side beam end are respectively connected by connecting cables with U-shaped slots for buckling with the transverse stiffening bottom plate of the steel box beam. The U-shaped slot is placed horizontally, one end of the connecting cable is connected to the earring at the bottom of the U-shaped slot, and the other end of the connecting cable is connected to the cantilever work platform. That is, after the platform is installed, in order to prevent the cantilever section from shaking left and right, two U-shaped slots are designed, earrings are welded on the bottom of the U-shaped slots, and the U-shaped slots are buckled into the two sides of the transverse stiffening bottom plate respectively. The opening width of the U-shaped slot is slightly larger than the thickness of the bottom plate for easy buckling. A traction cable is passed through the earrings and pulled downward on the cantilever work platform, tied and fixed, and easy to install and disassemble.

[0011] Further preferred: the cantilever work platform includes two parallel main beams, and multiple connecting rods are connected between the two main beams at intervals. The connecting rods between the two main beams are fully covered with steel plates as a work standing platform, and the steel plates can be non-slip steel plates. That is, the cantilever work platform is the direct working area for operators to implement welding. It is a connecting rod composed of channel steel and angle steel. Two channel steels are used as main beams, with a length of 5.6m and a horizontal spacing of 80cm. 8# angle steel is used as a transverse connection between the main beams, with a spacing of 80cm, and 3mm thick steel plates are fully covered on them.

[0012] Further preferably, the side beams and the top beams are connected with reinforcing connecting rods to make the connection between the side beams and the top beams more stable.

[0013] The main structure of the movable welding work platform for the bottom plate of the steel box beam includes a top beam, a side beam and a cantilever work platform. The upper end of the side beam is welded and fixed to one end of the top beam, and the lower end of the side beam is welded and fixed to one end of the cantilever work platform. The side beam is connected with the top beam and the cantilever work platform to form a C-shaped structure. The bottom of the top beam is equipped with a walking wheel for walking in the longitudinal direction of the steel box beam surface. It extends from the side of the steel box beam to the bottom of the steel box beam as a welding work platform for the bottom plate of the steel box beam. It can be moved on the steel box beam, is not restricted by terrain conditions, has good flexibility, and has low construction costs. After the platform is installed, in order to prevent the cantilever section from shaking left and right, two U-shaped slots are designed, and earrings are welded on the bottom of the U-shaped slots. The U-shaped slots are buckled into the two sides of the transverse stiffening bottom plate respectively. The opening width of the U-shaped slot is slightly larger than the thickness of the bottom plate for easy buckling. A traction rope is passed through the earrings, pulled downward on the cantilever work platform, and tied and fixed to make the work platform more stable. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a structural schematic diagram of the movable welding work platform for the bottom plate of the steel box beam;

[0015] Figure 2 It is a schematic diagram of the installation structure of the movable welding work platform for the bottom plate of the steel box beam in working state;

[0016] Figure 3It is a schematic diagram of the connection structure between the cantilever work platform and the transverse stiffening base plate;

[0017] The names corresponding to the numbers in the figure are:

[0018] 1. Cantilever work platform; 2. Towing rope; 3. U-shaped slot; 4. Guardrail; 5. Diagonal rod; 6. Travel wheel; 7. Counterweight box; 8. Top beam; 9. Strengthening connecting rod; 10. Side beam; 11. Horizontal truss; 12. Main beam; 13. Truss; 14. Vertical rod; 15. Main beam; 16. Steel plate 17. Connecting rod; 18. Earring; 19. Horizontal stiffening base plate. DETAILED DESCRIPTION

[0019] In order to make the technical solution and advantages of the present application more clear, the technical solution is clearly and completely described below in conjunction with embodiments. Example

[0020] A movable welding work platform for the bottom plate of a steel box beam comprises a top beam 8, a side beam 10 and a cantilever work platform 1. The upper end of the side beam 10 is welded and fixed to one end of the top beam 8. The side beam 10 and the top beam 8 are connected with a reinforcing connecting rod 9. The lower end of the side beam 10 is welded and fixed to one end of the cantilever work platform 1. The side beam 10 is connected to the top beam 8 and the cantilever work platform 1 to form a C-shaped structure. The bottom of the top beam 8 is equipped with a walking wheel 6 for walking in the longitudinal direction of the steel box beam surface. A counterweight box 7 is arranged on the top surface of the top beam 8 away from the end of the side beam 10. The top beam 8 comprises two parallel main beams 12. A plurality of trusses 13 are connected between the two main beams 12 at intervals. The top beam 8 is a suspended force-bearing rod of the structure, including a truss 13 composed of channel steel and angle steel. Two channel steels are used as the main beam 12, which is 3m long and 80cm apart. , angle steel is used as truss 13 for horizontal connection between the two main beams 12, with a spacing of 80cm, and the top beam 8 is located on the top plate of the steel box beam; the side beam 10 includes two left vertical rods 14 and two right vertical rods 14, and the two left vertical rods 14 and the two right vertical rods 14 are connected to the main beam 12 on the left side of the top beam 8 and the main beam 12 on the right side, and multiple horizontal trusses 11 are connected between the two left vertical rods 14, between the two right vertical rods 14, and between the left vertical rods 14 and the right vertical rods 14 at the end, that is, the side beam 10 is composed of four channel steel vertical rods 14, with a length of 4m, arranged in double rows, with a spacing of 80cm within the row and a spacing of 60cm between the rows, and Φ8 steel bars are used as horizontal trusses 11 on the outside to horizontally connect the vertical rods 14 in pairs, with a spacing of 30cm, and used as a step ladder for people to go up and down synchronously.

[0021] The ballast box 7 is provided with a movable door on the top to facilitate the placement of the ballast block. The ballast box 7 is an important component of the structural force, and is welded with 3mm thick steel plates to form a 0.8m×0.8m×0.8m box body, which is welded and fixed to the top beam 8. A movable door is provided on the top of the box body for placing the ballast block.

[0022] The number of the traveling wheels 6 is four rubber wheels with a braking function, which are installed at the bottom of the two main beams 12 in a bilaterally symmetrical manner, so that the structure can be moved as a whole under human push or other traction.

[0023] The cantilever work platform 1 is surrounded by a guardrail 4. The guardrail 4 is formed by welding Φ8 steel bars and is arranged on the outer edge of the cantilever work platform 1 facing the air.

[0024] The cantilever work platform 1 is connected to the side beam 10 by a diagonal tie rod 5 as an auxiliary force-bearing member of the cantilever work platform 1. The diagonal tie rod 5 is an auxiliary force-bearing member of the cantilever work platform 1 to reduce the maximum deflection and stress of the cantilever work platform 1. Two channel steels are used to diagonally connect the side beam 10 and the cantilever work platform 1. The angle between the diagonal tie rod 5 and the horizontal is 30°, the upper end is connected to the side beam 10, and the lower end is connected to the main beam 15 of the cantilever work platform 1.

[0025] The two sides of the cantilever work platform 1 away from the side beam 10 are respectively connected with U-shaped slots 3 for buckling with the transverse stiffening bottom plate 19 of the steel box beam through connecting cables. The U-shaped slots 3 are placed horizontally, one end of the connecting cable is connected to the earring 18 at the bottom of the U-shaped slot 3, and the other end of the connecting cable is connected to the cantilever work platform 1. That is, after the platform is installed, in order to prevent the cantilever section from shaking left and right, two U-shaped slots 3 are designed, and earrings 18 are welded on the bottom of the U-shaped slots 3. The U-shaped slots 3 are buckled into the two sides of the transverse stiffening bottom plate 19 respectively. The opening width of the U-shaped slots 3 is slightly larger than the thickness of the bottom plate for easy buckling. A traction cable 2 is passed through the earring 18, pulled downward on the cantilever work platform 1, tied and fixed, and easy to install and disassemble.

[0026] The cantilever work platform 1 comprises two parallel main beams 15, and a plurality of connecting rods 17 are connected between the two main beams 15 at intervals. The connecting rods 17 between the two main beams 15 are fully covered with steel plates 16 as a work standing platform, and the steel plates 16 can be non-slip steel plates. That is, the cantilever work platform 1 is the direct working area for the operator to perform welding, and the connecting rods 17 are composed of channel steel and angle steel. Two channel steels are used as the main beams 15, which are 5.6m long and 80cm apart horizontally. The main beams 15 are connected horizontally with 8# angle steels, with a spacing of 80cm, and are fully covered with 3mm thick steel plates 16.

[0027] The design and construction steps of this steel box girder bottom plate movable welding work platform are as follows:

[0028] Step 1: Complete the processing of all structural components according to the design dimensions and transport them to the construction site for assembly and welding.

[0029] Step 2: Connect each rod on site according to the structural drawing, weld them firmly, strictly control the welding quality, and carefully check the specifications, dimensions, spacing and angles of the rods.

[0030] Step 3: Use a crane to lift the assembled structure onto the steel box girder. The top beam and running wheels are supported on the top plate of the steel box girder. The side beams are close to the side ends of the steel box girder flange plates facing downward. The cantilever work platform extends under the steel box girder. The entire C-shaped structure holds the steel box girder from the side.

[0031] Step 4: Place the counterweight in the counterweight box and configure different weights according to actual needs.

[0032] Step 5. After checking that all parts are in good contact, turn the travel wheel into the braking state and personnel can carry out welding operations.

[0033] Step 6. After a section is welded, the personnel evacuate the platform, release the travel wheel brake, push the platform to the next working section, turn the travel wheel back into the braking state, and continue the operation. Repeat this process until all welding work is completed.

[0034] Step 7. After welding is completed and passed the inspection, remove the counterweight blocks in the counterweight box, use a crane to lift the entire structure away from the steel box girder, and place it on site for dismantling and removal.

[0035] The above description is not a limitation of the present application, and the present application is not limited to the above examples. Any changes, modifications, additions or substitutions made by ordinary technicians in this technical field within the essential scope of the present application should fall within the scope of protection of the present application.

Claims

1. A movable welding work platform for a steel box girder bottom plate, comprising a top beam (8), a side beam (10) and a cantilever work platform (1), wherein the upper end of the side beam (10) is welded and fixed to one end of the top beam (8), the lower end of the side beam (10) is welded and fixed to one end of the cantilever work platform (1), the side beam (10) is connected to the top beam (8) and the cantilever work platform (1) to form a C-shaped structure, and the bottom of the top beam (8) is equipped with a walking wheel (6) for walking in the longitudinal direction of the bridge on the steel box beam surface, characterized in that: A counterweight box (7) is arranged on the top surface of the end of the top beam (8) away from the side beam (10), and the top beam (8) includes two parallel main beams (12), and a plurality of trusses (13) are connected between the two main beams (12) at intervals; the side beam (10) includes two left vertical bars (14) and two right vertical bars (14), and the two left vertical bars (14) and the two right vertical bars (14) are connected to the main beam (12) on the left side and the main beam (12) on the right side of the top beam (8) respectively, and a plurality of horizontal trusses (11) are respectively connected between the two left vertical bars (14), between the two right vertical bars (14), and between the left vertical bars (14) and the right vertical bars (14) at the end.

2. The movable welding work platform for bottom plate of steel box beam according to claim 1 is characterized in that: A movable door is provided on the top of the counterweight box (7) to facilitate placement of the counterweight.

3. The movable welding work platform for bottom plate of steel box beam according to claim 1 is characterized in that: The number of the traveling wheels (6) is four rubber wheels with a braking function, which are installed at the bottom of the two main beams (12) in a bilaterally symmetrical manner.

4. The movable welding work platform for bottom plate of steel box beam according to claim 1 is characterized in that: The cantilever work platform (1) is surrounded by a guardrail (4).

5. The movable welding work platform for bottom plate of steel box beam according to claim 1 or 4, characterized in that: The cantilever work platform (1) and the side beam (10) are connected with an inclined tie rod (5) serving as an auxiliary force-bearing rod of the cantilever work platform (1).

6. The movable welding work platform for bottom plate of steel box beam according to claim 1 or 4, characterized in that: The cantilever work platform (1) is provided with U-shaped slots (3) for buckling with the transverse stiffening bottom plate (19) of the steel box beam on both sides of the end away from the side beam (10) through connecting cables. The U-shaped slots (3) are placed horizontally, one end of the connecting cable is connected to the earring (18) at the bottom of the U-shaped slot (3), and the other end of the connecting cable is connected to the cantilever work platform (1).

7. The movable welding work platform for bottom plate of steel box beam according to claim 1 or 4, characterized in that: The cantilever work platform (1) comprises two parallel main beams (15), a plurality of connecting rods (17) are connected between the two main beams (15) at intervals, and the connecting rods (17) between the two main beams (15) are fully covered with steel plates (16) serving as a working standing platform, and the steel plates (16) can be anti-slip steel plates.

8. The movable welding work platform for bottom plate of steel box beam according to claim 1 is characterized by: The side beam (10) and the top beam (8) are connected via a reinforcing connecting rod (9).

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