Splicing method for steel bridge steel box girder and newly-added steel box body

Abstract

The invention provides an assembling method for a steel bridge steel box girder and a newly-added steel box body. The method comprises the steps that at least two hoisting holes are formed in preset positions of an existing steel bridge cantilever; after a lifting hook of external lifting equipment penetrates through the lifting hole from the upper side of the cantilever arm of the existing steel bridge, the lifting hook is connected with a weight box to be lifted, and the weight box is lifted to a first preset position through the external lifting equipment and stopped; hanging a chain block below the existing steel bridge cantilever arm, lifting the counterweight box body at the first preset position to a welding position through the chain block, and welding and fixing the counterweight box body and the existing steel bridge cantilever arm; and the lifting hook is moved out of the lifting hole, and the lifting hole is blocked, so that the assembly of the counterweight box body is completed. By means of the method, efficient and safe widening transformation of the existing steel bridge can be achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of bridge engineering, and more specifically, to an assembling method of a steel box girder of a steel bridge and a newly added steel box body. Background Art

[0002] With the acceleration of urbanization and the surge in traffic, existing steel bridges are increasingly unable to meet modern traffic needs due to their limited carrying capacity and traffic efficiency. Therefore, widening and remodeling existing steel bridges to expand the bridge deck width and improve traffic capacity has become an important topic in the current bridge engineering field. During the widening and remodeling process, the installation of the newly added heavy steel box is particularly critical, which not only affects the overall stability and safety of the bridge structure, but also directly affects the construction period and cost.

[0003] At present, the traditional construction method of adding heavy steel boxes often faces challenges such as high construction difficulty, significant impact on existing bridge structures, and long construction periods. For example, during the hoisting process, improper selection or operation of hoisting equipment may cause damage to the existing bridge structure; if welding operations are not carried out at the appropriate time and under appropriate conditions, they may also have an adverse effect on the safety and durability of the bridge. In addition, the long construction period will also aggravate traffic congestion and bring inconvenience to traffic. Summary of the invention

[0004] In view of the above problems, the purpose of the present invention is to provide a method for assembling steel box girders of steel bridges and newly added steel box bodies, so as to solve the problems existing in the existing hoisting and splicing method of lattice shell structures, which makes it difficult to accurately control the deformation during the docking process, easily leading to insufficient docking accuracy and uneven structural force.

[0005] The assembly method of the newly added steel box body provided by the present invention includes: opening at least two lifting holes at preset positions on the existing steel bridge cantilever; passing the hook of the external lifting equipment through the lifting hole from the upper side of the existing steel bridge cantilever, connecting with the counterweight box body to be lifted, and lifting the counterweight box body to the first preset position and stopping by the external lifting equipment; hanging a hand winch under the existing steel bridge cantilever, lifting the counterweight box body at the first preset position to the welding position by the hand winch, and welding and fixing the counterweight box body to the existing steel bridge cantilever; removing the hook from the lifting hole, and sealing the lifting hole to complete the assembly of the counterweight box body.

[0006] In addition, an optional technical solution is that a passage hole is pre-opened on the counterweight box body, and after the counterweight box body is hoisted to the first preset position and stopped, the method further includes:

[0007] A hanging platform connected to the passage hole is arranged on the cantilever arm of the existing steel bridge;

[0008] The hanging platform is used for construction workers to enter the interior of the counterweight box through the passage hole.

[0009] In addition, an optional technical solution is that the counterweight box includes a box bottom plate, a box belly plate and a partition plate arranged on the box bottom plate; wherein a first lifting ear plate is arranged on the box bottom plate;

[0010] A second lifting lug plate is provided below the existing steel bridge cantilever arm;

[0011] The hand chain hoist is arranged between the first lifting ear plate and the second lifting ear plate.

[0012] In addition, an optional technical solution is that the existing steel bridge cantilever includes a cantilever top plate, a cantilever web plate, and a lower flange plate located below the cantilever web plate; wherein,

[0013] The counterweight box is fitted and limited between the web of the boom and the lower flange plate.

[0014] In addition, an optional technical solution is to weld and fix the counterweight box to the existing steel bridge cantilever arm, including:

[0015] Weld and fix the double angle welds of the partition plate and the lower flange plate, and after welding is completed, remove the hand chain hoist;

[0016] The butt weld between the bottom plate of the box body and the bottom plate of the steel bridge of the existing steel bridge is welded and fixed, and the groove weld between the web plate of the box body and the top plate of the cantilever arm is welded and fixed.

[0017] In addition, an optional technical solution is to weld and fix the counterweight box to the existing steel bridge cantilever arm, and further includes:

[0018] The double-sided weld between the partition and the web of the boom is welded and fixed.

[0019] In addition, an optional technical solution is to further include: a first limiting code plate is arranged on the bottom plate of the box body; and the bottom plate of the box body and the bottom plate of the steel bridge are welded and fixed by the first limiting code plate.

[0020] In addition, an optional technical solution is to further include: a second limit code plate is arranged on the belly plate of the box body; and the belly plate of the box body and the top plate of the cantilever arm are welded and fixed by the second limit code plate.

[0021] In addition, an optional technical solution is to weld at least one fixed horizontal rib between the partition and the web of the cantilever arm.

[0022] On the other hand, the present invention provides a steel box girder of a steel bridge, and a new steel box is arranged below the cantilever arm of the steel bridge by utilizing the above-mentioned assembly method of the new steel box.

[0023] By utilizing the above-mentioned assembly method of the steel box girder of the steel bridge and the newly added steel box, the flexibility, accuracy and efficiency of the installation of the counterweight box can be improved through the cooperation of the hand winch and the external lifting equipment; in addition, it can effectively reduce the impact of the construction process on the existing steel bridge, reduce interference with road traffic, and realize efficient and safe widening and reconstruction on the basis of the existing steel bridge, which has important practical application value and promotion prospects.

[0024] In order to achieve the above and related purposes, one or more aspects of the present invention include the features that will be described in detail later. The following description and the accompanying drawings describe some exemplary aspects of the present invention in detail. However, these aspects indicate only some of the various ways in which the principles of the present invention can be used. In addition, the present invention is intended to include all these aspects and their equivalents. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] By referring to the following description in conjunction with the accompanying drawings, and with a more comprehensive understanding of the present invention, other objects and results of the present invention will become more clear and easy to understand. In the accompanying drawings:

[0026] Figure 1 It is a flow chart of an assembly method of a newly added steel box according to an embodiment of the present invention;

[0027] Figure 2 A top view of an existing steel bridge and a newly added box according to an embodiment of the present invention;

[0028] Figure 3 The hoisting state of the existing steel bridge and the newly added box according to an embodiment of the present invention Figure 1 ;

[0029] Figure 4 The hoisting state of the existing steel bridge and the newly added box according to an embodiment of the present invention Figure 2 ;

[0030] Figure 5 The hoisting state of the existing steel bridge and the newly added box according to an embodiment of the present invention Figure 3 ;

[0031] Figure 6 A welding principle diagram of an existing steel bridge and a newly added box according to an embodiment of the present invention;

[0032] Figure 7 This is a construction completion diagram of a counterweight box according to an embodiment of the present invention;

[0033] Figure 8 is a structural schematic diagram of a counterweight box according to an embodiment of the present invention;

[0034] Fig. 9 A schematic diagram of the hoisting principle of a hand chain hoist according to an embodiment of the present invention;

[0035] Fig.10 It is a partial enlarged view of the counterweight box according to an embodiment of the present invention.

[0036] Markings in the accompanying drawings: existing steel box girder 1 of steel bridge, bottom plate 11 of steel bridge, web plate 12 of steel bridge, existing cantilever arm 2 of steel bridge, lifting hole 21, top plate 22 of cantilever arm, lower flange plate 23, web plate 24 of cantilever arm, concrete pier 3, counterweight box 4, bottom plate 41 of box body, web plate 42 of box body, partition plate 43, horizontal rib 44, passage hole 5, external lifting equipment 6, wire rope 61, hook 62, hand hoist 7, wire rope 71, first lifting ear plate 72, second limiting code plate 18, first limiting code plate 28, weld 81 between bottom plate of cantilever arm and bottom plate of box body, weld 82 between top plate of cantilever arm and web plate of box body, weld 83 between web plate of cantilever arm and partition plate, weld 84 between lower flange plate and partition plate, and hanging platform 9.

[0037] The same reference numerals throughout the drawings indicate similar or corresponding features or functions. DETAILED DESCRIPTION

[0038] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution 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. 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.

[0039] In the following description, for the purpose of illustration, in order to provide a comprehensive understanding of one or more embodiments, many specific details are set forth. However, it is apparent that these embodiments may also be implemented without these specific details. In other examples, for ease of describing one or more embodiments, known structures and devices are shown in the form of block diagrams.

[0040] In the description of the present invention, it is to be understood that the orientations or positional relationships indicated by the following terms “center”, “longitudinal”, “lateral”, “length”, “width”, “thickness”, “up”, “down”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inside”, “outside”, “clockwise”, “counterclockwise”, “axial”, “radial”, “circumferential”, etc. are based on the orientations or positional relationships shown in the accompanying drawings and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the content or structure of the present invention.

[0041] In order to solve the challenges of the existing method of constructing a new counterweight steel box, such as great construction difficulty, significant impact on the existing bridge structure, and long construction period, the present invention provides a new steel box and a splicing method, in which the counterweight box is lifted from the bottom of the steel bridge and welded and fixed under the cantilever of the steel bridge, thereby adding a counterweight to the existing steel box girder and achieving the effect of widening and reconstruction. The flexibility, accuracy and efficiency of the installation of the counterweight box can be improved through the cooperation of a hand winch and external lifting equipment. In addition, it can effectively reduce the impact of the construction process on the existing steel bridge, reduce interference with road traffic, and achieve efficient and safe widening and reconstruction on the basis of the existing steel bridge, which has important practical application value and promotion prospects.

[0042] In order to describe in detail the structure of the steel box girder of the steel bridge and the assembly method of the newly added steel box body of the present invention, the specific embodiments of the present invention will be described in detail with reference to the accompanying drawings.

[0043] Figure 1 The schematic flow chart of the method for assembling a newly added steel box according to an embodiment of the present invention is shown; Figures 2 to 10 The schematic structures of the existing steel bridge, the counterweight box and the hand chain hoist according to the embodiments of the present invention are respectively shown.

[0044] like Figures 1 to 10 As shown together, the assembling method of the newly added steel box body of the embodiment of the present invention includes:

[0045] S100: Open at least two lifting holes at preset positions on the cantilever of the existing steel bridge.

[0046] Specifically, before the lifting construction, it is necessary to first confirm that the steel bridge needs to be newly equipped with a counterweight box 4, and open at least two lifting holes 21 at the set positions. The lifting holes 21 are through holes that vertically penetrate the cantilever arm of the steel box girder of the steel bridge. In order to facilitate the external lifting equipment 6 to extend to the bottom of the steel box girder to lift the counterweight box 4, the aperture of the lifting hole 21 needs to be larger than the size of the hook 62 of the external lifting equipment 6 to ensure that the hook 62 and the wire rope 61 can pass smoothly.

[0047] Among them, the existing steel bridge cantilever 2 is located on both sides of the existing steel bridge steel box girder 1, and the counterweight box 4 is located between the angle formed by the steel box girder and the cantilever after positioning. The counterweight box 4 forms a counterweight width for the steel box girder, thereby improving its overall structural strength and compressive resistance.

[0048] In addition, in order to prevent the steel wire rope 61 of the external lifting equipment 6 from rubbing against the edge of the lifting hole 21 and damaging the bridge deck during the lifting process, protective pads, such as rubber pads, can be laid inside and around the lifting hole 21 to prevent the steel wire rope from rubbing against the surrounding of the lifting hole 21 during the lifting process, thereby ensuring the integrity of the bridge deck.

[0049] S200: After the hook of the external lifting equipment passes through the lifting hole from the upper side of the existing steel bridge cantilever, it is connected to the counterweight box 4 to be lifted, and the counterweight box 4 is lifted to the first preset position by the external lifting equipment and stopped.

[0050] Among them, two external lifting devices 6, such as a car crane, can be set up, and the hooks 62 of the two external lifting devices 6 are connected to the counterweight box 4 after passing through different installation holes, and the counterweight box 4 is lifted to the first preset position and stopped to slow down the lifting speed to ensure the accuracy and safety of the lifting of the counterweight box 4. The first preset position can be a position about 500mm away from the lower edge of the steel bridge boom, which can facilitate the subsequent installation of the hand chain hoist 7, and the position of the counterweight box 4 can be fine-tuned by the hand chain hoist 7 to ensure the accuracy and firmness of its splicing.

[0051] S300: Hang a hand winch below the existing steel bridge cantilever arm, lift the counterweight box at the first preset position to the welding position by the hand winch, and weld and fix the counterweight box and the existing steel bridge cantilever arm.

[0052] Among them, the counterweight box 4 includes a box bottom plate 41, a box belly plate 42 and a partition plate 43 arranged on the box bottom plate 41; to facilitate the installation and use of the hand winch 7, a first lifting ear plate 72 is arranged on the box bottom plate 41, and a second lifting ear plate is arranged under the existing steel bridge cantilever 2. The wire rope 71 of the hand winch 7 is arranged between the first lifting ear plate 72 and the second lifting ear plate. At least two hand winches 7 are provided, and the counterweight box 4 at the first preset position is further lifted to the welding position by the hand winch 7.

[0053] In addition, in order to facilitate the operator's welding work on the counterweight box 4, a passage hole 5 for construction workers to enter can be pre-opened on the counterweight box 4. After the counterweight box 4 is lifted to the first preset position and stopped, it also includes: a hanging platform connected to the passage hole 5 is set on the existing steel bridge cantilever 2, and the hanging platform 9 can extend from the upper surface of the steel bridge cantilever to the bottom of the steel bridge cantilever. Construction workers can reach the location of the counterweight box 4 through the hanging platform 9, and then enter the interior of the counterweight box 4 through the passage hole 5.

[0054] In a specific embodiment of the present invention, an existing steel bridge box girder 1 is arranged on a concrete pier 3, and an existing steel bridge cantilever 2 is distributed on both sides of the steel bridge box girder, including a cantilever top plate 22, a cantilever web 24 and a lower flange plate 23 located below the cantilever web 24; wherein, before the welding operation, the counterweight box body 4 is fitted and limited between the cantilever web 24 and the lower flange plate 23 by a hand winch 7.

[0055] Among them, the counterweight box 4 and the existing steel bridge cantilever 2 are welded and fixed, including: welding and fixing the double-angle welds between the partition and the lower flange plate 23, and after the welding is completed, removing the hand winch 7; welding and fixing the butt welds between the box bottom plate 41 and the steel bridge bottom plate 11 of the existing steel bridge, and welding and fixing the groove welds between the box web 42 and the cantilever top plate 22.

[0056] In addition, the counterweight box 4 and the existing steel bridge cantilever 2 are welded and fixed, and the double-sided weld between the partition plate 43 and the cantilever web 24 is also welded and fixed.

[0057] Among them, a first limit plate 28 can be set on the box bottom plate 41; the box bottom plate 41 and the steel bridge bottom plate 11 are welded and fixed by the first limit plate 28. Similarly, a second limit plate 18 can be set on the box web 42, and the box web 42 and the cantilever top plate 22 are welded and fixed by the second limit plate 18.

[0058] As a specific example, the process of positioning and fixing the counterweight box 4 includes: 1. Use the hand chain hoist 7 to lift the counterweight box 4 to the predetermined position, and after it is stably positioned, the external lifting equipment is unhooked and moved out; 2. Adjust the weld between the box bottom plate 41 of the counterweight box 4 and the existing steel bridge bottom plate 11, and the box web plate 42 of the counterweight box 4 and the top plate 22 of the existing steel bridge cantilever 2 to ensure accurate docking. 3. Use the code plate to fix the counterweight box 4 to prevent displacement during the subsequent welding process.

[0059] After the above positioning and fixing are completed, preliminary welding is performed, which may include: first, welding the double-sided fillet weld between the partition 43 and the lower flange plate 23 of the steel bridge arm, that is, the weld 84 between the lower flange plate 23 and the partition 43. The magnetic weld has little impact on the safety of the existing steel bridge structure, and can be welded when the road is normally open. After the welding is completed, the hand chain hoist 7 can be unloaded and removed. Then, the non-critical welds are welded, including the groove weld between the box web 42 of the counterweight box 4 and the existing cantilever top plate and the butt weld between the box bottom plate 41 of the counterweight box 4 and the cantilever bottom plate of the existing steel bridge, that is, the weld 81 between the cantilever bottom plate and the box bottom plate and the weld 82 between the cantilever top plate and the box web, which also have little impact on the safety of the existing steel bridge structure.

[0060] Then, the key welds are welded and the structure is reinforced. The process includes: 1) closing the existing steel bridge traffic, and welding the double-sided fillet welds between the bulkhead 43 of the counterweight box 4 and the cantilever web 24 of the existing steel bridge (i.e., the weld 83 between the cantilever web and the bulkhead) to ensure the welding quality. In order to ensure the connection strength and the overall strength of the structure, at least one fixed horizontal rib 44 can be welded between the bulkhead 43 and the cantilever web 24, and the bridge structure status is continuously monitored during the welding process to ensure construction safety.

[0061] S400: removing the lifting hook from the lifting hole and sealing the lifting hole to complete the assembly of the counterweight box.

[0062] Among them, after all welding is completed, the lifting hole 21 is sealed with equal strength to restore the completion of the bridge deck, and then a comprehensive quality inspection and acceptance is carried out to ensure that the construction quality meets the design requirements.

[0063] Corresponding to the above-mentioned method for assembling the newly added steel box, the present invention further provides a steel box girder for a steel bridge, and the newly added steel box is arranged below the cantilever arm of the steel bridge by using the above-mentioned method for assembling the newly added steel box. It should be noted that the embodiment of the steel box girder for the steel bridge can refer to the description in the embodiment of the method for assembling the newly added steel box, and will not be described one by one here.

[0064] According to the above-mentioned method of assembling the steel box girder of the steel bridge and the newly added steel box body, the counterweight box body is lifted from the bottom of the steel bridge and welded and fixed under the cantilever of the steel bridge, so as to add a counterweight to the existing steel box girder and achieve the effect of widening and reconstruction. The flexibility, accuracy and efficiency of the installation of the counterweight box body can be improved through the cooperation of the hand winch and the external lifting equipment. In addition, it can effectively reduce the impact of the construction process on the existing steel bridge, reduce interference with road traffic, achieve efficient and safe widening and reconstruction based on the existing steel bridge, and improve the structural strength and traffic capacity of the existing steel bridge.

[0065] As described above, the assembly method of the steel box girder of the steel bridge and the newly added steel box body according to the present invention is described by way of example with reference to the accompanying drawings. However, those skilled in the art should understand that various improvements can be made to the assembly method of the steel box girder of the steel bridge and the newly added steel box body proposed by the present invention without departing from the content of the present invention. Therefore, the protection scope of the present invention should be determined by the content of the attached claims.

Claims

1. A method for assembling a newly added steel box, characterized in that: include: At least two lifting holes are opened at preset positions on the cantilever of the existing steel bridge; After the hook of the external lifting equipment passes through the lifting hole from the upper side of the existing steel bridge cantilever arm, it is connected to the counterweight box to be lifted, and the counterweight box is lifted to a first preset position by the external lifting equipment and stopped; Hanging a hand chain hoist below the existing steel bridge cantilever arm, lifting the counterweight box at the first preset position to the welding position by the hand chain hoist, and welding and fixing the counterweight box to the existing steel bridge cantilever arm; The hook is removed from the lifting hole, and the lifting hole is sealed to complete the assembly of the counterweight box.

2. The method for assembling a newly added steel box according to claim 1 is characterized in that: A passage hole is pre-opened on the counterweight box body, and after the counterweight box body is hoisted to a first preset position and stopped, the method further includes: A hanging platform connected to the passage hole is arranged on the cantilever arm of the existing steel bridge; The hanging platform is used for construction workers to enter the interior of the counterweight box through the passage hole.

3. The method for assembling a newly added steel box according to claim 1 is characterized in that: The counterweight box body comprises a box body bottom plate, a box body web plate and a partition plate arranged on the box body bottom plate; wherein a first lifting ear plate is arranged on the box body bottom plate; A second lifting lug plate is provided below the existing steel bridge cantilever arm; The hand chain hoist is arranged between the first lifting ear plate and the second lifting ear plate.

4. The method for assembling a newly added steel box according to claim 3 is characterized in that: The existing steel bridge cantilever comprises a cantilever top plate, a cantilever web plate and a lower flange plate located below the cantilever web plate; wherein, The counterweight box is fitted and limited between the web of the boom and the lower flange plate.

5. The method for assembling a newly added steel box according to claim 4 is characterized in that: The counterweight box body and the existing steel bridge cantilever are welded and fixed, including: Weld and fix the double angle welds of the partition plate and the lower flange plate, and after welding is completed, remove the hand chain hoist; The butt weld between the bottom plate of the box body and the bottom plate of the steel bridge of the existing steel bridge is welded and fixed, and the groove weld between the web plate of the box body and the top plate of the cantilever arm is welded and fixed.

6. The method for assembling a newly added steel box according to claim 5 is characterized in that: The counterweight box body is welded and fixed to the existing steel bridge cantilever arm, and further comprises: The double-sided weld between the partition and the web of the boom is welded and fixed.

7. The method for assembling a newly added steel box according to claim 5, characterized in that: Also includes: A first limit code plate is arranged on the bottom plate of the box body; The box bottom plate and the steel bridge bottom plate are welded and fixed via the first limiting code plate.

8. The method for assembling a newly added steel box according to claim 5, characterized in that: Also includes: A second limit code plate is arranged on the belly plate of the box body; The box body belly plate and the cantilever arm top plate are welded and fixed via the second limiting code plate.

9. The method for assembling a newly added steel box according to claim 6, characterized in that: At least one fixed horizontal rib is welded between the partition plate and the web plate of the cantilever arm.

10. A steel box girder of a steel bridge, characterized in that: By utilizing the method for assembling a new steel box as described in any one of claims 1 to 9, a new steel box is arranged below the cantilever of the steel bridge.

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