Protective device for welding ring opening of steel box girder

Abstract

The utility model discloses a protective device for welding ring openings of steel box girders, which comprises a frame body arranged on the outer side of the butt joint position of the ring openings of the adjacent steel box girders in a surrounding manner, and protruding parts are arranged at the two transverse ends of the top surface of each steel box girder respectively. Limiting rods used for being matched with the protruding parts in an abutting mode are arranged at the positions, close to the inner sides of the protruding parts, of the top of the frame body correspondingly. Fireproof and windproof protection structures are arranged at the bottom of the frame body and in the two side portions, in the width direction of the steel box girder, of the frame body correspondingly. According to the protective device for welding the ring opening of the steel box girder, it can be ensured that normal passing of the lower portion is not affected when welding is conducted on the ring opening on the upper portion, the wind shielding function is achieved, the welding seam quality is further ensured, meanwhile, the protective device can be detached and reused, and the construction cost can be reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of steel structure bridge construction, in particular to a protective device for ring-mouth welding of a steel box beam. Background Art

[0002] In municipal engineering construction, steel box girders are widely used in urban overpasses due to their many advantages, including good torsional resistance, fast construction speed, and minimal impact on traffic. Most of these bridges need to cross urban expressways, main roads, or highways, and welding of steel box girders is a critical step. Currently, on-site construction of steel box girders typically involves welding the ring ends after the steel box girder sections are hoisted into place. However, welding the ring ends of steel box girders produces welding slag or molten iron, which can affect the safety of pedestrians and vehicles below, posing a significant safety hazard. To ensure safety, the conventional practice is to temporarily close the road below and set up a temporary welding operation platform and a fire basin at the weld joint to handle the welding slag or molten iron. However, when constructing steel box girders in areas with heavy traffic, where road closures cannot be extended and where setting up a construction platform is difficult, protecting the ring end welding of the steel box girder becomes more difficult. Although the existing technology uses a method of setting up a mobile platform on the steel box girder to handle the ring welding and safety protection of the steel box girder, the entire mobile platform device is complex and costly. In addition, for situations such as pedestrian bridges where the pier spacing is short and the bridge deck width is narrow, the mobile platform cannot be effectively installed or cannot cover the welding construction of all the rings.

[0003] Therefore, it is necessary to provide a protective device for the existing steel box girder ring welding construction work, so that it can ensure that welding above does not affect the normal passage below, and at the same time has a windproof function to further ensure the quality of the weld. Utility Model Content

[0004] In view of this, the purpose of the present invention is to provide a protective device for steel box girder ring welding, which can ensure that welding above does not affect normal traffic below, and also has a windproof function, further ensuring the quality of the weld. At the same time, the protective device is detachable and reusable, which can reduce construction costs.

[0005] The utility model provides a protective device for welding the ring mouth of a steel box beam, comprising a frame body arranged around the outside of the joint of the ring mouths of adjacent steel box beams, wherein the transverse ends of the top surface of the steel box beam respectively have protrusions, and the top of the frame body is provided with limit rods for abutting and cooperating with the protrusions at positions close to the inner sides of the protrusions, and the bottom of the frame body and the two side parts in the width direction of the steel box beam are provided with protective structures for fire and wind protection.

[0006] Furthermore, the frame body includes a left rectangular frame disposed on the left side of the butt joint of adjacent steel box girder ring openings along the length direction of the steel box girder, and a right rectangular frame disposed on the right side of the butt joint of adjacent steel box girder ring openings. A connecting steel pipe is provided between the left rectangular frame and the right rectangular frame for connection and fixation.

[0007] Furthermore, the protective structure includes a steel bar mesh and a protective cloth. The steel bar mesh is disposed between the left rectangular frame and the right rectangular frame, and the protective cloth is laid on the inner side of the steel bar mesh.

[0008] Furthermore, both the left rectangular frame and the right rectangular frame are formed by fixing and connecting a number of mutually overlapping steel pipes through steel pipe connecting fasteners to form a rectangular frame.

[0009] Furthermore, a gap is reserved between the frame body and the bottom of the steel box girder, and gaps are also respectively reserved between the two side parts of the frame body in the width direction of the steel box girder and the two side parts of the steel box girder in the width direction.

[0010] Furthermore, the limiting rod is erected and contacts and limits the inner side wall of the convex part.

[0011] The beneficial effects of the present utility model are as follows: The protective device for steel box girder ring welding provided by the present utility model is mainly used for the protection during the ring welding of steel box girder structures such as pedestrian overpasses. By using this protective device, it is not necessary to close the road below during the ring welding of the steel box girder, reducing traffic pressure and ensuring welding safety; this measure frame also has a wind shielding function, further ensuring the welding quality of the ring opening. At the same time, this protective device is detachable and reusable, which can reduce construction costs. Description of the Drawings

[0012] The following further describes the present utility model in conjunction with the drawings and embodiments:

[0013] Figure 1 It is a cross-sectional structure schematic diagram of the protective device and the steel box girder in the present utility model;

[0014] Figure 2 It is a side view of the structure of the protective device at the butt joint of adjacent steel box girder ring openings in the present utility model;

[0015] Description of the reference numerals: 1 - frame body; 2 - steel box girder; 3 - convex part; 4 - limiting rod; 5 - steel bar mesh; 6 - protective cloth; 7 - butt joint of steel box girder ring opening; 8 - left rectangular frame; 9 - right rectangular frame; 10 - connecting steel pipe; 11 - connecting fastener. Detailed Embodiment

[0016] As shown in the figure, a protective device for the girth welding of steel box girders provided by the present utility model includes a frame body 1 disposed around the outside of the butt joint of adjacent steel box girder girths. The transverse ends of the top surface of the steel box girder 2 respectively have raised portions 3. At the inner side positions of the frame body 1 near the raised portions 3, limit rods 4 for abutting and cooperating with the raised portions are respectively provided. Protective structures for fire prevention and wind prevention are provided at the bottom of the frame body 1 and inside both side portions in the width direction of the steel box girder 2. Among them, the frame body 1 is mainly connected and limited to the steel box girder 2 in the width direction and the length direction through the abutting and cooperation of the limit rods 4 with the raised portions 3 on the top surface of the steel box girder 2, and in the height direction, it can be limited by the self-weight of the frame body 1. Adopting this connection and limiting method is beneficial to the disassembly and reuse of the protective device and can reduce the construction cost. At the same time, protective structures for fire prevention and wind prevention are provided at the bottom of the frame body 1 and inside both side portions in the width direction of the steel box girder 2. The protective structure can prevent welding slag or molten iron from splashing down during the girth welding of the steel box girder, so that it is not necessary to close the road below the girth of the steel box girder, reducing traffic pressure and ensuring welding safety. It also has a wind shielding function, further ensuring the girth welding quality. During specific installation, after the protective device is assembled as a whole, it is installed at the butt joint of the first section of the steel box girder by a crane. Then, after the second section of the steel box girder is installed, the protective device is manually adjusted to the girth butt joint of the steel box girder and fixed by the cooperation of the limit rod 4 and the raised portion 3. Finally, after the butt joint is welded and inspected to be qualified, the device is removed and transferred to the next butt joint for use.

[0017] In this embodiment, the frame body 1 includes a left rectangular frame 8 disposed on the left side of the butt joint 7 of adjacent steel box girder girths along the length direction of the steel box girder and a right rectangular frame 9 disposed on the right side of the butt joint 7 of adjacent steel box girder girths. A connecting steel pipe 10 is provided between the left rectangular frame 8 and the right rectangular frame 9 for connection and fixation; combined Figure 1 and Figure 2 As shown, the frame body 1 in this solution is formed into a whole by connecting two rectangular frames with the same structure and respectively disposed on the left and right sides of the butt joint 7 of adjacent steel box girder girths. The butt joint 7 of the steel box girder can be completely covered between the left rectangular frame 8 and the right rectangular frame 9 to protect the welding operation at this place.

[0018] In this embodiment, the protective structure includes a steel mesh 5 and a protective cloth 6, wherein the steel mesh 5 is arranged between the left rectangular frame 8 and the right rectangular frame 9, and the protective cloth 6 is laid on the inner side of the steel mesh 5; wherein the steel mesh 5 is connected and fixed to the left rectangular frame 8 and the right rectangular frame 9 respectively by iron wire and forms a protective net in the gap between the left rectangular frame 8 and the right rectangular frame 9, namely between the bottom rods of the left rectangular frame 8 and the right rectangular frame 9 and between the two side rods of the left rectangular frame 8 and the right rectangular frame 9, and then the protective cloth 6 is fully spread on the inner side of the steel mesh 5, wherein the protective cloth 6 adopts a three-proof cloth made of glass fiber, which has the effects of waterproof, fireproof and corrosion-resistant, and can fully meet the protection requirements of this scheme.

[0019] In this embodiment, the left rectangular frame 8 and the right rectangular frame 9 are formed by a plurality of overlapping steel pipes fixedly connected by steel pipe fasteners 11 to form a rectangular frame; Figure 1 and Figure 2 As shown, the left rectangular frame 8 and the right rectangular frame 9 are formed by overlapping idle or discarded steel pipes on site, and are mainly connected and fixed by steel pipe connecting fasteners 11, which can effectively reduce manufacturing costs.

[0020] In this embodiment, a gap is reserved between the frame body 1 and the bottom of the steel box beam 2, and gaps are also reserved between the two sides of the frame body 1 located in the width direction of the steel box beam 2 and the two sides of the steel box beam in the width direction; Figure 1 As shown, by reserving gaps between the frame body 1 and the bottom of the steel box girder 2 and between the two side portions of the frame body 1 in the width direction of the steel box girder 2 and the two side portions in the width direction of the steel box girder, when the operators are performing welding operations, welding slag or molten iron can splash outward onto the protective structure and be blocked by the protective structure, thereby avoiding harm to the operators and people passing on the road below.

[0021] In this embodiment, the limiting rod 4 is vertically arranged and contacts the inner wall of the protrusion 3 to limit the position; Figure 1 As shown, the limit rod 4 is a short steel pipe, which is arranged at a position close to the inner wall of the raised portion 3 in a vertical direction perpendicular to the horizontal steel pipe on the top surface of the frame body 1 through a connecting fastener 11, and is limited by contacting the inner wall of the raised portion 3 with the lower part; in this solution, the limit rod 4 is arranged at four places on the top surface of the frame body 1 and is distributed in a rectangular structure to prevent the frame body 1 from shaking in the width direction of the steel box girder 2.

[0022] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model and are not limiting. Although the utility model is described in detail with reference to the preferred embodiments, ordinary technicians in this field should understand that the technical solution of the utility model can be modified or replaced by equivalents without departing from the purpose and scope of the technical solution of the utility model, which should be included in the scope of the claims of the utility model.

Claims

1. A protective device for the circumferential welding of steel box girders, characterized in that: It includes a frame body surrounding and arranged outside the adjacent steel box girder ring joint. The transverse two ends of the top surface of the steel box girder respectively have convex parts. At positions near the inner sides of the convex parts, limiting rods for abutting and cooperating with the convex parts are respectively arranged at the top of the frame body. Fireproof and windproof protection structures are arranged at the bottom of the frame body and inside both side parts in the width direction of the steel box girder.

2. The protective device for the ring opening welding of the steel box girder according to claim 1, characterized in that: The frame body includes a left rectangular frame arranged on the left side of the adjacent steel box girder ring joint along the length direction of the steel box girder and a right rectangular frame arranged on the right side of the adjacent steel box girder ring joint. A connecting steel pipe is arranged between the left rectangular frame and the right rectangular frame for connection and fixation.

3. The protective device for ring welding of steel box beams according to claim 2, characterized in that: The protection structure includes a steel bar mesh and a protection cloth. The steel bar mesh is arranged between the left rectangular frame and the right rectangular frame, and the protection cloth is laid inside the steel bar mesh.

4. The protective device for the ring opening welding of the steel box girder according to claim 2, wherein: Both the left rectangular frame and the right rectangular frame are formed by fixing and connecting a number of mutually overlapping steel pipes through steel pipe connection fasteners to form a rectangular frame.

5. The protective device for the girth welding of steel box girders according to claim 1, characterized in that: A gap is reserved between the frame body and the bottom of the steel box girder. Gaps are also respectively reserved between both side parts of the frame body in the width direction of the steel box girder and both side parts of the steel box girder in the width direction.

6. The protective device for the girth welding of steel box girders according to claim 1, wherein: The limiting rod is erected and the lower part thereof contacts and limits the inner side wall of the convex part.

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