Box girder unequal-height sliding system

Abstract

The utility model relates to the technical field of bridge construction, in particular to a box girder unequal-height sliding system which comprises a continuous jack, a counter-force base, a steel strand set, an unequal-height sliding rail and a box girder, the bottom of the box girder is fixedly connected with a sliding shoe, and the sliding shoe is connected to the unequal-height sliding rail in a sliding mode; the counter-force seat is arranged at one end of the unequal-height sliding rail and connected with the unequal-height sliding rail through high-strength bolts. The continuous jack is mounted behind the counter-force seat; and one end of the steel strand group is fixed in a sliding shoe at the bottom of the box girder, and the other end of the steel strand group is fixed in a jack. The unequal-height sliding rail comprises a first sliding way and a second sliding way, the height of the first sliding way is different from that of the second sliding way, and the first sliding way and the second sliding way are each formed by splicing a plurality of single-section sliding ways. The problem that when a bridge line is located on a certain longitudinal slope, an existing incremental launching method is unstable in the box girder sliding process is solved.

Description

Technical Field

[0001] This utility model relates to the field of bridge construction technology, and in particular to a box girder unequal height sliding system. Background Technology

[0002] In the field of bridge engineering construction, box girders are a common structural form widely used in various bridge projects. The erection and installation of box girders are key aspects of bridge construction, and the quality, schedule, and cost of their construction methods and techniques directly affect the quality of bridge construction.

[0003] Traditional box girder erection methods often reveal numerous limitations when facing special terrain and track conditions. For example, when the bridge track is on a certain longitudinal slope, conventional sliding track designs cannot guarantee the stability of the box girder during the sliding process. Under the action of the longitudinal slope, the box girder will generate tilting force, making its stress state on the track complex and prone to safety hazards such as uneven sliding, deviation, or even overturning. Taking the conventional jacking method for box girder sliding construction as an example, under longitudinal slope conditions, this method is difficult to precisely control the reaction force during the jacking process, resulting in uneven force at both ends of the box girder and difficulty in maintaining a consistent sliding speed. This increases the construction difficulty and risk, and the construction efficiency is low, with a long time required for each sliding operation, seriously affecting the progress of the entire project.

[0004] In order to solve the above-mentioned technical problems, this utility model designs a box girder unequal height sliding system. Utility Model Content

[0005] This invention provides a box girder unequal height sliding system, aiming to solve the instability problem of existing incremental launching methods during box girder sliding when the bridge alignment is on a certain longitudinal slope. The technical solution is as follows:

[0006] A box girder unequal height sliding system includes a continuous jack, a reaction seat, a steel strand assembly, an unequal height sliding track, and a box girder. A sliding shoe is fixedly connected to the bottom of the box girder and slidably connected to the unequal height sliding track. The reaction seat is located at one end of the unequal height sliding track and connected to the track using high-strength bolts. The continuous jack is installed behind the reaction seat. One end of the steel strand assembly is fixed inside the sliding shoe of the box girder, and the other end is fixed inside the jack.

[0007] Based on the above technical solution, the unequal height sliding track includes a first slide and a second slide, the first slide and the second slide are at different heights, and both the first slide and the second slide are spliced ​​together from multiple single slide sections.

[0008] Based on the above technical solution, the cross-sections of the first and second slides are trapezoidal with a narrower top and a wider bottom.

[0009] Furthermore, the number of steel strands in the continuous jack, reaction seat, and steel strand group is 2 each.

[0010] Preferably, the individual slide sections are connected by bolts.

[0011] Beneficial effects

[0012] Compared with existing technologies, the beneficial effects of this utility model are: improved construction stability: by designing sliding tracks with unequal heights, the box girder can maintain a horizontal state even under longitudinal slope conditions, solving the tilting force problem caused by longitudinal slope in the traditional jacking method, and improving the stability and safety during the sliding process. Enhanced adaptability: the sliding track is composed of multiple single-section sliding tracks spliced ​​together and connected by bolts. This design not only reduces transportation difficulty and cost, but also allows for flexible adjustment of the sliding track length according to actual construction needs and adaptation to different terrain conditions. Attached Figure Description

[0013] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only one embodiment of this utility model. For those skilled in the art, other embodiments can be derived from the provided drawings without creative effort.

[0014] Figure 1 : A schematic diagram of the structure of this utility model;

[0015] Figure 2 Top view of the slide and ski boot described in this utility model;

[0016] Figure 3 : A schematic diagram of the installation of the slide and the sliding shoe described in this utility model;

[0017] Figure 4 : A top view of the installation of the slide rail and the beam box described in this utility model;

[0018] Figure 5 Side view of the installation of the slide and beam box described in this utility model. Detailed Implementation

[0019] The present invention will be further described below with reference to the accompanying drawings and examples:

[0020] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0021] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0022] In the description of this utility model, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0023] like Figure 1 As shown, a box girder unequal-height sliding system includes continuous jacks 1, reaction seats 2, unequal-height sliding tracks 4, and a box girder 5. The unequal-height sliding tracks 4 are approximately aligned with the longitudinal slope angle of the railway line. Longitudinal slope refers to the gradient of the railway line along its length, usually expressed as a percentage (‰). For example, a 12‰ longitudinal slope means that the height changes by 12 meters for every 1000 meters of travel.

[0024] like Figure 5 As shown, pier 8 is a pier with a longitudinal slope. In order to adapt to this longitudinal slope of the line, an unequal height sliding track 4 was designed during the lateral movement construction of the box girder.

[0025] like Figure 4 and Figure 5 As shown, the unequal height sliding track 4 includes a first slide rail 41 and a second slide rail 42, and the first slide rail 41 and the second slide rail 42 are at different heights.

[0026] like Figure 2 As shown, both the first slide rail 41 and the second slide rail 42 are composed of multiple single-section slide rails 43 spliced ​​together. The first slide rail 41 and the second slide rail 42 are at different heights, and the height difference between them is calculated based on the actual longitudinal slope of the track. For example, for a 32-meter-long box girder and a longitudinal slope of 12‰, the height difference between the two ends of the unequal-height sliding track 4 is 190 millimeters.

[0027] The box girder 5 is kept horizontal in the sliding system by the unequal height design of the first slide rail 41 and the second slide rail 42.

[0028] like Figure 3As shown, a sliding shoe 6 is fixedly connected to the bottom of the box girder 5, and the sliding shoe 6 is slidably connected to the unequal-height sliding track 4; the sliding shoe 6 can ensure that the box girder 5 remains horizontal along its entire length. This not only improves the stability during the sliding process, but also avoids potential safety hazards caused by the tilting of the box girder.

[0029] The sliding shoe 6 can be adjusted or replaced according to actual needs to adapt to different specifications of box girders and different construction site conditions. In addition, the selection of sliding shoe materials, such as applying silicone grease to the sliding shoe, can further improve its wear resistance and service life, and reduce maintenance costs.

[0030] The reaction seat 2 is located at one end of the unequal-height sliding track 4 and connected to the unequal-height sliding track 4 using high-strength bolts. As part of the traction system, the main function of the reaction seat 2 is to provide a stable support point for installing the continuous jack 1. By using high-strength bolts to firmly fix it to the sliding track, it can be ensured that the reaction seat can withstand the huge reaction force generated during traction, avoiding the risk of displacement or overturning.

[0031] The continuous jack 1 is installed behind the reaction seat 2; one end of the steel strand group 3 is anchored in the sliding shoe 6 at the bottom of the box girder 5, and the other end is fixed inside the jack 1. The reaction seat 2 is firmly connected to the unequal height sliding track 4 by high-strength bolts, providing a stable support point for the continuous jack 1. This ensures that the continuous jack 1 can apply sufficient traction force without moving or overturning.

[0032] The continuous jack 1 is installed behind the reaction seat, allowing the traction force to act directly on the reaction seat 2 and then be transmitted to the ground or foundation structure such as bridge piers, ensuring the stability of the entire system. The continuous jack 1 is connected to the sliding shoe 6 at the bottom of the box girder 5 by the steel strand group 3, realizing direct traction of the box girder 5 and avoiding the problem of difficult precise control of the jacking reaction force that may occur in the traditional jacking method.

[0033] The steel strand group 3, as the medium for transmitting traction force, has high strength and good flexibility, and can provide reliable traction force without damaging the box girder.

[0034] The steel strands in the steel strand group 3 are φs15.2 steel strands. The number of steel strands in the steel strand group 3 is at least 6. The number of strands is not less than 6, and can be adjusted according to working conditions. φs15.2 specification steel strands have high tensile strength and good toughness, and can withstand large traction forces. This specification of steel strand is typically used in applications requiring high load-bearing capacity, ensuring that safety accidents will not occur due to steel strand breakage during box girder sliding.

[0035] Traditional sliding track and construction equipment also present inconveniences in terms of transportation and installation. The integral sliding track is large in size and heavy in weight, requiring special transportation tools and routes during transportation, which increases transportation costs and difficulties; during on-site installation, the hoisting and positioning of large equipment also consumes a lot of time and manpower, which is not conducive to efficient construction.

[0036] The slide is composed of multiple individual slide sections 43, which are connected by bolts. A monolithic slide is large and heavy, making it difficult to transport. The segmented design allows each individual slide section 43 to be prefabricated in the factory and transported to the construction site. This not only reduces transportation difficulty but also decreases reliance on special transport vehicles and routes, thereby lowering transportation costs. The bolted connections allow for flexible adjustment of the number of individual slide sections 43 according to actual construction needs. If it is necessary to adjust the total length of the slide or adapt to different terrain conditions, simply add or remove the corresponding number of individual slide sections 43 and reassemble them.

[0037] The slideway is processed and transported to the site in sections according to the position of the pad stones 7 on the pier 8, which facilitates transportation and on-site hoisting.

[0038] The first slide rail 41 and the second slide rail 42 have a trapezoidal cross-section that is narrower at the top and wider at the bottom. The trapezoidal cross-section increases the width of the slide rail's bottom, providing a larger support area. This helps to distribute the load applied to the slide rail, allowing it to more stably withstand the various forces generated during the box girder's sliding process. The narrow-at-the-top, wide-at-the-bottom design optimizes the slide rail's mechanical properties, giving it better bending strength and rigidity. This shape can better cope with vertical pressure and horizontal pushing and pulling forces, ensuring smoothness and safety during sliding. Under large traction forces, the trapezoidal cross-section can provide stronger support, reducing the possibility of deformation and thus ensuring the overall structural integrity of the sliding track.

[0039] The sliding surface of the unequal-height sliding track 4 is coated with silicone grease. Silicone grease provides excellent lubrication, further reducing friction between the track and the sliding shoe. It also offers good corrosion protection, forming a protective film on the metal surface to isolate air and moisture, effectively preventing the track from rusting due to exposure to humid environments. Especially during outdoor construction or in humid environments, this protective film can significantly extend the track's service life.

[0040] The number of continuous jacks 1, reaction seats 2, and steel strand groups 3 are all two. By setting up a traction system consisting of continuous jacks 1, reaction seats 2, and steel strand groups 3 at each end of the box girder 5, it can be ensured that the force on both sides of the box girder 5 is uniform, avoiding the problem of displacement or tilting caused by unilateral traction.

[0041] The system also includes an intelligent CNC main control console, which is connected to the continuous jack 1 and used to uniformly control the operation of the continuous jack 1. The intelligent CNC main control console achieves traction synchronization by automatically controlling the high-pressure pump station, ensuring that both ends of the box girder 5 move synchronously during sliding. The intelligent CNC main control console can uniformly control the working status of the two sets of continuous jacks 1, ensuring consistent traction force on both sides and achieving synchronous sliding. This is crucial for ensuring the smooth movement of the box girder 5, especially with small beam joint spacing, preventing the beam joint from jamming or making sliding difficult.

[0042] In use, the unequal-height sliding track 4 is designed according to the longitudinal slope of the bridge line, which includes a first sliding track 41 and a second sliding track 42. The height difference between the two sliding tracks is calculated based on the actual longitudinal slope of the line, and is assembled by bolting together multiple single-section sliding tracks 43.

[0043] The reaction seat 2 is fixed to one end of the unequal height sliding track 4 with high-strength bolts, serving as a stable support point for the continuous jack 1. Then, the continuous jack 1 is installed behind the reaction seat 2, and each box girder 5 is equipped with such a traction system at both ends, namely two sets of continuous jacks, reaction seats and steel strands, to ensure uniform force distribution.

[0044] The bottom of the box girder 5 is fixedly connected to a sliding shoe 6, which can slide along the unequal height sliding track 4. One end of the steel strand group 3 is anchored inside the sliding shoe 6, while the other end is fixed to the continuous jack 1.

[0045] An intelligent CNC main control console is introduced to uniformly control the working status of continuous jack 1. Traction synchronization is achieved through automatic control of the high-pressure pump station, ensuring that both ends of the box girder move synchronously during the sliding process, avoiding deviation or tilting caused by unilateral traction. Continuous jack 1 is activated, and traction force is applied through the steel strand group 3, causing the box girder 5 to smoothly slide along the unequal-height sliding track 4 to the predetermined position. During this process, the sliding surface is coated with anti-rust oil or silicone grease, which not only reduces frictional resistance but also extends the service life of the track. Throughout the sliding process, the intelligent CNC main control console monitors the sliding speed and position in real time to ensure the safety and stability of the sliding process. Any deviations or abnormalities can be adjusted promptly.

[0046] It should be noted that the continuous jack 1, reaction seat 2, and intelligent CNC main control console in this embodiment are all general standard parts or components known to those skilled in the art. Their structure and principle can be learned by those skilled in the art through technical manuals or conventional experimental methods.

[0047] The present invention has been described above by way of example, but the present invention is not limited to the specific embodiments described above. Any modifications or variations made based on the present invention shall fall within the scope of protection claimed by the present invention.

Claims

1. A box girder unequal height launching system characterized by: The utility model relates to a continuous box girder sliding device, including continuous jack (1), counterforce seat (2), steel strand group (3), unequal height sliding track (4) and box girder (5), the bottom of box girder (5) is fixed and connected sliding shoe (6), and sliding shoe (6) is slidably connected on unequal height sliding track (4), counterforce seat (2) is arranged in one end of unequal height sliding track (4) and is connected with unequal height sliding track (4) with high -strength bolt, and continuous jack (1) is installed behind counterforce seat (2), one end of steel strand group (3) is fixed in the sliding shoe (6) of box girder (5), and the other end is fixed in jack (1).

2. A box girder unequal height launching system according to claim 1 wherein The unequal height sliding track (4) includes first slide (41) and second slide (42), the first slide (41) and second slide (42) are inconsistent in height, and the first slide (41) and second slide (42) are both spliced by a plurality of single slide (43).

3. A box girder unequal slip system according to claim 2, wherein The first slide (41) and second slide (42) are trapezoidal in cross section.

4. The unequal height launching system for a box girder as claimed in claim 3, wherein The number of continuous jack (1), counterforce seat (2) and steel strand group (3) is 2.

5. The unequal height launching system for a box girder as defined in claim 2 wherein The single slide (43) is connected by bolts.

6. A box girder unequal slip system as claimed in claim 1, wherein The steel strands in the steel strand group (3) are φ s 15.2 steel strands.

7. A box girder unequal slip system according to claim 6 wherein The number of steel strands in the steel strand group (3) is at least 6.

8. The unequal height launching system for a box girder as defined in claim 4 wherein The sliding surface of the unequal height sliding track (4) is coated with silicone grease.

9. A box girder unequal slip system as claimed in claim 4, wherein The utility model also includes an intelligent numerical control console connected with the continuous jack (1) for unified control of the work of the continuous jack (1).

10. A box girder unequal slip system according to claim 9, wherein The intelligent numerical control console realizes traction synchronization through automatic control of a high-pressure pump station, ensuring synchronous movement of both ends during the sliding process of the box girder.

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