Mounting structure of steel box girder

Abstract

The utility model provides a mounting structure of a steel box girder, which comprises a first base plate and a second base plate, the first base plate is movably arranged on a slide rail, and the second base plate is parallel to the first base plate; the sand box is arranged between the first base plate and the second base plate, the sand box is provided with an inner cavity, a first positioning piece is movably arranged in the inner cavity, and one end of the first positioning piece protrudes out of the inner cavity and abuts against the second base plate; the second positioning piece is arranged on the second base plate, and the second positioning piece is located on the moving path of the first positioning piece; and the first guide piece comprises a plurality of guide grooves and guide columns which are arranged in the inner cavity, and the guide columns are connected with the first positioning piece so that the first positioning piece can move in the direction close to the inner cavity under the action of external force. The technical problem that in the prior art, after a steel box girder is assembled, a mounting support is difficult to detach is solved.

Description

Technical Field

[0001] This utility model relates to the field of bridge construction technology, and in particular to an installation structure for a steel box girder. Background Technology

[0002] Bridge construction in mountainous cities often faces challenging conditions due to proximity to railways and severely limited vertical space. Constructing steel structure bridges in this complex environment presents the following difficulties: 1. Difficult or nonexistent access roads. Methods such as constructing crossings over railway lines can be ruled out. Waiting for tunnels to be completed before constructing bridges within the "enclosure" would jeopardize construction progress. 2. Steep slopes in some areas significantly restrict the fabrication, transportation, and erection of large steel box girders, hindering the effective use of machinery. 3. Protecting the railway crossings is challenging. To ensure safe railway operation and shorten the construction window for crossing railway lines, current methods such as cantilever assembly and incremental launching are insufficient to meet railway protection requirements. Bridge rotation construction is gradually becoming the only viable option for railway protection. In mountainous areas near railway lines, the gantry cranes are restricted by the railway and can only be erected parallel to the railway line. Furthermore, in mountainous environments, mobile lifting equipment lacks access roads to move along the gantry's axis. Considering the need for a balance between the capacity and cost-effectiveness of steel box girder lifting equipment, large-tonnage lifting equipment is generally not used to cover the entire gantry crane. Therefore, the usual practice is to erect an assembly platform on the gantry, transport the steel box girders in sections to the lifting location, and then use lifting equipment to assemble them on the gantry. After assembly, the gantry cranes then slide the gantry crane. In the construction of bridges spanning rivers, bridge piers are often located on both banks or in shallow river areas. Steel box girders in the middle span can be transported directly to the hoisting position by barges and then lifted directly by cranes. However, due to insufficient water depth on the riverbanks, barges may not have enough draft to transport the steel box girders to the hoisting position. In such cases, it is more common to erect scaffolding on the side spans, install tracks on the scaffolding, and hoist the steel box girders onto the scaffolding on the side spans. The steel box girders are then slid to the designated position by towing. Whether using rotation erection or sliding construction, a sliding trolley is used for the steel box girders. After all the steel box girders are assembled, the sliding trolley and scaffolding need to be unloaded. Before the scaffolding is unloaded, the steel box girders are in a cantilever state. How to efficiently and conveniently unload the steel box girders while ensuring uniform stress on the steel box girders and safe scaffolding has become a major technical challenge in the current scaffolding dismantling and unloading process. Summary of the Invention

[0003] In view of the shortcomings of the existing technology, the present invention provides an installation structure for steel box girders, which solves the technical problem that the installation brackets are difficult to remove after the steel box girders are assembled.

[0004] According to the embodiments of this utility model, the following technical solution is adopted:

[0005] An installation structure for a steel box girder includes a slide rail erected on the ground and an installation structure slidably disposed on the slide rail, the installation structure comprising:

[0006] A first pad and a second pad, wherein the first pad is movably mounted on the slide rail, and the second pad is arranged parallel to the first pad;

[0007] A sand box is disposed between the first pad and the second pad. The sand box has an inner cavity. A first positioning member is movably disposed in the inner cavity. One end of the first positioning member protrudes out of the inner cavity and abuts against the second pad.

[0008] The second positioning element is disposed on the second pad, and the second positioning element is located on the moving path of the first positioning element;

[0009] The first guide member includes a plurality of guide grooves and guide posts disposed in the inner cavity. The guide posts are connected to the first positioning member so that when the first positioning member moves toward the inner cavity under the action of external force, the second positioning member abuts against the second pad.

[0010] Preferably, the inner cavity is filled with a number of fine sands, and the end of the inner cavity near the first pad is provided with multiple sand discharge ports.

[0011] Preferably, the sand discharge ports are distributed radially at intervals along the inner cavity.

[0012] Preferably, the first positioning element includes:

[0013] The mounting plate slides against the inner wall of the inner cavity and is connected to the guide post;

[0014] Multiple positioning rods are spaced apart on the mounting plate.

[0015] Preferably, the mounting plate is provided with multiple sand-penetrating holes.

[0016] Preferably, the mounting structure further includes a second guide member, the second guide member comprising:

[0017] Multiple connecting rods are rotatably mounted on the mounting plate;

[0018] The counterweight is movably mounted in the inner cavity via the connecting rod.

[0019] Preferably, the counterweight is coaxially arranged with the mounting plate.

[0020] Preferably, the second positioning element is a prefabricated rod disposed on the first pad, and the length of the prefabricated rod is greater than the height of the sand box.

[0021] Preferably, the first pad and / or the second pad are provided with pad blocks.

[0022] Compared with the prior art, the present invention has the following advantages: the installation structure can not only effectively support and accurately position the steel box girder, but also facilitate disassembly after the steel box girder is spliced, without affecting the lowering of the steel box girder, thus improving the installation efficiency and safety of the steel box girder. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the steel box girder located in the installation structure in one embodiment of the present invention;

[0024] Figure 2 This is a side view of the mounting structure in one embodiment of the present invention;

[0025] Figure 3 for Figure 2 Sectional view of AA.

[0026] In the above attached figures: 1. Slide rail; 2. First pad; 3. Sand box; 301. Sand discharge port; 4. Inner chamber; 5. Guide groove; 6. Guide column; 7. Second pad; 8. Mounting plate; 801. Sand passage hole; 802. Positioning rod; 9. Connecting rod; 10. Counterweight block; 11. Precast rod; 12. Steel box girder. Detailed Implementation

[0027] To make the objectives, technical solutions, and beneficial effects of this utility model clearer, the technical solutions of this utility model are further described below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of this utility model and are not intended to limit it.

[0028] See Figures 1 to 3 This utility model provides an installation structure for a steel box girder 12, including a slide rail 1 erected on the ground and an installation structure slidably disposed on the slide rail 1. The installation structure includes:

[0029] A first pad 2 and a second pad 7 are provided, wherein the first pad 2 is movably disposed on the slide rail 1, and the second pad 7 is disposed parallel to the first pad 2.

[0030] A sand box 3 is disposed between the first pad 2 and the second pad 7. The sand box 3 has an inner cavity 4. A first positioning member is movably disposed in the inner cavity 4. One end of the first positioning member protrudes outside the inner cavity 4 and abuts against the second pad 7.

[0031] The second positioning element is disposed on the second pad 7, and the second positioning element is located on the moving path of the first positioning element;

[0032] The first guide member includes a plurality of guide grooves 5 and guide posts 6 disposed in the inner cavity 4. The guide posts 6 are connected to the first positioning member so that when the first positioning member moves toward the inner cavity 4 under the action of external force, the second positioning member abuts against the second pad 7.

[0033] In this embodiment, to construct the bridge in mountainous terrain, two sliding rails 1 are first erected at this location. The two sliding rails 1 are located on both sides of the bridge pier, providing basic support and guidance for the entire installation structure. (Due to the shape of the steel box girder 12, it needs to be supported by the installation structure before segmented welding. After all the steel box girders 12 are assembled, the temporary construction supports for the steel box girder 12 need to be removed. Before the supports are removed, the steel box girder 12 is in a cantilever state, so a platform cannot be directly erected for the steel box girder 12.) 2. Assemble the structure (this is existing technology, which those skilled in the art can clearly understand through their knowledge); specifically, during the welding and assembly of each steel box girder 12, first, the installation structure is set on the slide rail 1. To maintain stable support for the steel box girder 12, each segment of the steel box girder 12 should be supported by four installation structures. After all steel box girder 12 segments are assembled, a winch is used to pull the steel box girder 12 forward on the sliding rail to the designated position. This step is repeated until all steel box girder 12 are installed and assembled. Once completed, the installation structure of the steel box girder 12 can be removed. The installation structure includes: a first pad 2 slidably mounted on the slide rail 1; a second pad 7 parallel to the first pad 2, which together provide a stable support plane for the steel box girder 12; a sand box 3 located between the first pad 2 and the second pad 7, and having an inner cavity 4; a first positioning member movably mounted in the inner cavity 4, one end of which protrudes outside the inner cavity 4 and abuts against the second pad 7, for supporting the steel box girder 12 on the second pad 7; and a second positioning member welded to the second pad 7. Furthermore, located on the moving path of the first positioning member, the inner cavity 4 is also provided with a first guide member for guiding the movement of the first positioning member. The first guide member includes three guide grooves 5 and three guide posts 6 located in the inner cavity 4. When the guide posts 6 and the first positioning member descend in the inner cavity 4 under the action of external force, the guide posts 6 and guide grooves 5 guide the descent direction of the first positioning member, so as to achieve a stable descent until the second positioning member abuts against the second pad 7. At this time, the sand box 3 can be removed, and then the other components of the installation structure can be removed.

[0034] The unloading process of this structure does not affect the support structure, and the stress on the support remains basically unchanged, ensuring the overall stress on the box girder and the support, and guaranteeing the safety of the support structure. After unloading, the installation structure is not damaged and can be used as an unloading device for other supports. Where the project still requires a sliding trolley, it can be reassembled into an installation structure, allowing for reuse. Compared to the traditional method of directly using oxy-acetylene gas to cut the sliding trolley at high temperature, this method directly damages the sliding trolley structure. Furthermore, during the dismantling process, the stress on the remaining sliding structural blocks gradually increases, leading to increased local stress on the steel box girder 12 and the support, which is detrimental to the stress on the steel box girder 12 and the support. Alternatively, jacks can be used to lift the steel box girder 12 as a whole, using the support as a fulcrum to lift the entire box girder upwards, and then removing the sliding trolley. However, during the lifting process, the local stress on the steel box girder 12 and the support is very large, and the local deformation of the steel box girder 12 and the safety of the support cannot be guaranteed. Moreover, controlling the hydraulic pressure of the jacks during the lifting process with multiple hydraulic jacks is also a challenge. Additionally, sand boxes 3 are installed at the top of the steel pipe piles of the support structure. Using sand boxes 3 for unloading is the most common method, but sand boxes 3 need to be installed on each steel pipe pile. Furthermore, the load borne by the sand boxes 3 is not only the weight of the upper steel box girder 12, but also the weight of all support components and protective measures above the sand boxes 3. This increases both the number of sand boxes 3 and the load they bear, making unloading with sand boxes 3 cumbersome and inefficient. Moreover, during the unloading process, the support structure above the sand boxes 3 will fall downwards as a whole, posing a significant safety risk. Compared to the existing steel box girder 12 installation structure, this installation structure allows for rapid unloading without damaging the original installation structure, and it can be reused repeatedly. It is simple to install and easy to remove.

[0035] The inner chamber 4 is filled with a plurality of fine sand, and a plurality of sand discharge ports 301 are provided at one end of the inner chamber 4 near the first pad 2. Furthermore, the sand discharge ports 301 are distributed radially at intervals along the inner chamber 4.

[0036] In this embodiment, fine sand is selected to fill the inner cavity 4 in the sand box 3. Multiple sand discharge ports 301 are provided at one end of the inner cavity 4 near the first pad 2. Opening the sand discharge ports 301 allows the fine sand to be removed from the inner cavity 4, so that the first positioning member can be moved downward along the guide groove 5. At the same time, the sand discharge ports 301 are distributed radially along the inner cavity 4 to ensure that the fine sand can be removed evenly in any direction. This is beneficial to more accurately control the amount of fine sand in the sand box 3, further stabilizing the displacement of the first positioning member and allowing the steel box beam 12 to sink steadily.

[0037] The first positioning component includes: a mounting plate 8, which slides against the inner wall of the inner cavity 4 and is connected to the guide post 6; and a plurality of positioning rods 802, spaced apart from the mounting plate 8. Further, the mounting plate 8 is provided with a plurality of sand-permeable holes 801.

[0038] In this embodiment, the mounting plate 8 slides against the inner wall of the inner chamber 4 of the sand box 3. When the mounting plate 8 moves downward in the inner chamber 4, its contact with the inner wall of the inner chamber 4 ensures stability and directionality during movement. The mounting plate 8 is connected to the limiting post, and its cooperation with the limiting groove further enhances the stability of the positioning rod 802 and the mounting plate 8 when they descend, thus making the steel box girder 12 more stable when it sinks. On the other hand, the mounting plate 8 is provided with multiple sand-permeable holes 801. The purpose of the sand-permeable holes 801 is to allow fine sand to pass through the sand-permeable holes 801 when the mounting plate 8 moves downward, thereby reducing the impact of the resistance of fine sand on the movement of the mounting plate 8. This helps to ensure that the mounting plate 8 can move downward more stably in the inner chamber 4, and also helps to adjust the pressure distribution in the sand box 3, thereby affecting the stability of the entire structure.

[0039] The mounting structure further includes a second guide member, which comprises: a plurality of connecting rods 9 rotatably mounted on the mounting plate 8; and a counterweight 10 movably mounted on the inner cavity 4 via the connecting rods 9. Furthermore, the counterweight 10 is coaxially arranged with the mounting plate 8.

[0040] In this embodiment, three connecting rods 9 are hinged to the mounting plate 8, and the counterweight 10 is movably disposed within the inner cavity 4. As the fine sand in the sand box 3 gradually decreases, the counterweight 10 gradually descends along with the decrease in fine sand. During this process, the center of gravity of the first positioning component can be adjusted synchronously. By adjusting the position of the counterweight 10, it is ensured that it maintains good balance and stability. The coaxial arrangement ensures that the counterweight 10 can be evenly distributed around the mounting plate 8, thereby providing a more balanced weight distribution. This avoids the first positioning component from shifting during descent under the influence of the gravity of the steel box beam 12, keeping it in a vertical position during displacement and preventing possible breakage or bending.

[0041] The second positioning element is a prefabricated rod 11 disposed on the first pad 2, and the length of the prefabricated rod 11 is greater than the height of the sand box 3.

[0042] In this embodiment, the second positioning component is specifically a prefabricated rod 11 welded to the first pad 2. The length of the prefabricated rod 11 is designed to be longer than the height of the sand box 3, ensuring that when the first positioning component descends in the inner chamber 4 due to the gradual reduction of fine sand in the sand box 3, the second positioning component can effectively abut against the second pad 7. By setting the prefabricated rod 11 with a length greater than the height of the sand box 3 as the second positioning component, the first positioning component is separated from the second pad 7, and the second positioning component assumes the supporting role. At this time, the sand discharge from the sand box 3 can be stopped, and the sand boxes 3 can be moved out of the first pad 2 in sequence using a winch.

[0043] The first pad 2 and the second pad 7 are provided with pad blocks.

[0044] In this embodiment, a pad (not shown) made of polytetrafluoroethylene is provided on both the first pad 2 and the second pad 7 to reduce the friction between the steel box girder 12 and the second pad 7 and between the first pad 2 and the slide rail 1, so that the steel box girder 12 can slide smoothly.

[0045] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of this utility model without departing from the spirit and scope of the technical solutions of this utility model, and all such modifications or substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A mounting structure of a steel box girder, comprising a slide rail erected on the ground, and a mounting structure slidably provided on the slide rail, characterized in that, The mounting structure comprises: a first pad plate movably arranged on the slide rail and a second pad plate arranged in parallel with the first pad plate; a sand box arranged between the first pad plate and the second pad plate, the sand box having an inner chamber, the inner chamber movably arranged with a first positioning member, one end of the first positioning member protruding outside the inner chamber and abutting against the second pad plate; a second positioning member arranged on the second pad plate, the second positioning member located in a moving path of the first positioning member; a first guide member comprising a plurality of guide grooves arranged in the inner chamber and a guide column, the guide column connected to the first positioning member, so that when the first positioning member is moved towards the inner chamber under an external force, the second positioning member abuts against the second pad plate.

2. The steel box girder installation structure according to claim 1, wherein The inner chamber is filled with fine sand, and one end of the inner chamber close to the first pad plate is provided with a plurality of sand discharge openings.

3. The steel box girder installation structure according to claim 2, wherein The sand discharge openings are distributed along the radial direction of the inner chamber.

4. The steel box girder installation structure according to claim 1, wherein The first positioning member comprises: a mounting disc slidingly fitted on an inner wall of the inner chamber and connected to the guide column; a plurality of positioning rods arranged at intervals on the mounting disc.

5. The steel box girder installation structure according to claim 4, wherein The mounting disc is provided with a plurality of sand passing holes.

6. The steel box girder installation structure according to claim 4 or 5, characterized by The mounting structure further comprises a second guide member, the second guide member comprising: a plurality of connecting rods movably arranged on the mounting disc; a counterweight movably arranged in the inner chamber through the connecting rods.

7. The steel box girder installation structure according to claim 6, wherein The counterweight is coaxially arranged with the mounting disc.

8. The steel box girder mounting structure according to claim 1, wherein The second positioning member is a prefabricated rod arranged on the first pad plate, and the length of the prefabricated rod is greater than the height of the sand box.

9. The steel box girder erection structure according to claim 1, wherein The first pad plate and / or the second pad plate is provided with a pad block.

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