Novel bailey beam

Abstract

The utility model provides a novel bailey beam which comprises a bailey beam body, supporting frames, inhaul cables and anchor seats, the lower end of the bailey beam body is provided with a plurality of supporting frames, the supporting frames are symmetrically arranged according to the midspan in the length direction of the bailey beam body, and the heights of the supporting frames are gradually reduced from the midspan to the two ends; the height of the support frame is adjustable; anchor seats are respectively arranged at the two ends of the bailey beam body; the two ends of the inhaul cable are transmitted into the anchor bases respectively, and an inhaul cable body penetrates through the cable saddle. The novel bailey beam has the advantages that the novel bailey beam with a self-balancing system can be formed through the existing bailey beam body, the inhaul cables and the supporting frames, original internal force distribution is changed, the high tensile property of the high-strength cables can be fully exerted, and the stress performance of the whole structure of the bailey beam is improved.

Description

Technical Field

[0001] This utility model relates to the field of bridge engineering technology, specifically to a novel Bailey bridge. Background Technology

[0002] Bailey bridges, also known as Bailey frames, Bailey panels, or Bailey trusses, were improved in the 1960s to become the 321 prefabricated highway steel bridge, also referred to as 321 Bailey beams, 321 Bailey frames, 321 Bailey panels, or 321 Bailey trusses. Due to their advantages such as convenient transportation and storage, simple installation, and strong load-bearing capacity, they have been widely used in engineering construction, flood control and disaster relief, and have played an irreplaceable role.

[0003] In recent years, bridge construction has expanded to coastal areas, reservoir areas, lake areas, mountainous areas, and deep canyons, making the construction environment increasingly complex. Bridge construction facilities such as trestle bridges, platforms, and supports urgently require larger spans. Furthermore, bridge construction equipment has undergone a dramatic transformation, with crawler cranes, rotary drilling rigs, and flatbed trucks becoming increasingly larger, their weight increasing from the conventional 50-80 tons to 100-200 tons. Consequently, the limitations of the load-bearing capacity of the most common Bailey bridge as a load-bearing beam are becoming increasingly apparent.

[0004] Many research institutions have made certain improvements to Bailey bridges. For example, China Railway Major Bridge Engineering Group Co., Ltd. has developed a "super Bailey bridge," which increases the weight per meter of a single section by 59%, improves the bending capacity by 88%, and increases the shear capacity by 113%. The main improvements include: 1. The height of the Bailey bridge has been adjusted from 1.5m for the 321 type to 2m. 2. The material for the vertical and diagonal members of the original 321 Bailey bridge has been changed from I8 I-beams to 80mm rectangular tubing; the chord material has been changed from double-layered 10-channel steel to double-layered 14a-channel steel. 3. The material has been changed from 16Mn steel to Q345B.

[0005] China Communications Highway Planning and Design Institute has developed the "HD200 Bailey Bridge," which boasts a 33% increase in strength and a 2.3-fold increase in stiffness. Key improvements include: 1. The height of the Bailey bridge has been increased from 1.5m (for the 321 type) to 2m. 2. The specifications of the profiles used for the vertical and diagonal members of the original 321 Bailey bridge have been upgraded. 3. The material has been changed from 16Mn steel to Q345B.

[0006] Xingtu Construction Co., Ltd. has developed the "XT300 Truss," which further enhances the load-bearing capacity of Bailey beams. The main improvements include: 1. The height of the Bailey beam has been adjusted from 1.5m for the 321 type to 3m. 2. The vertical and diagonal members of the original 321 Bailey beam have been changed to HM150*100, and the chord material has been changed from double-layered 10-channel steel to double-layered 20b-channel steel. 3. The material has been changed from 16Mn steel to Q355B.

[0007] With the development of engineering technology, the load-bearing capacity of the current 321 Bailey bridge beams can no longer meet the needs of the modern era. As can be seen from the three types of Bailey bridge beam improvement methods mentioned earlier, the current mainstream approach is to develop new products to replace 321 Bailey bridge beams. However, after years of accumulation, there is currently a huge inventory of 321 Bailey bridge beams. If we continue to develop new products to replace them according to the current approach, it will inevitably lead to a huge waste of resources. Moreover, the price of new Bailey bridge beams is generally 3-5 times that of 321 Bailey bridge beams, making the cost investment uneconomical. Therefore, providing a new type of Bailey bridge beam is of great significance. Utility Model Content

[0008] The purpose of this invention is to address at least one of the aforementioned shortcomings of the existing technology. For example, one objective of this invention is to provide a novel Bailey beam that improves the load-bearing capacity of the Bailey beam by adding components, has a reasonable structure, and controllable production costs.

[0009] To achieve the above objectives, this utility model provides a novel Bailey bridge, which may include: a Bailey bridge body, support frames, cables, and anchors. The lower end of the Bailey bridge body is provided with several support frames, which are symmetrically arranged along the length of the Bailey bridge body at the mid-span. The height of the support frames gradually decreases from the mid-span towards both ends. The height of the support frames is adjustable. Anchors are respectively provided at both ends of the Bailey bridge body. The cables pass through the anchors at both ends, and the cable body passes through the free ends of the support frames.

[0010] According to an exemplary embodiment of one aspect of the present invention, the Bailey beam body may include 321 Bailey beams.

[0011] According to an exemplary embodiment of one aspect of the present invention, the Bailey beam body may include a plurality of Bailey panels connected in sequence, and a support frame is provided at the connection position between the Bailey panels.

[0012] Furthermore, the dimensions of a single Bailey panel can be: 2-4m in length and 1-2m in height.

[0013] According to an exemplary embodiment of one aspect of the present invention, a cable saddle may be provided on the free end of the support frame.

[0014] According to an exemplary embodiment of one aspect of the present invention, the cable may include prestressed steel strand.

[0015] According to an exemplary embodiment of one aspect of the present invention, the anchor seat and the Bailey beam body can be connected by a steel pin.

[0016] According to an exemplary embodiment of one aspect of the present invention, a through-hole jack may be provided at the anchor position at one or both ends of the Bailey beam body.

[0017] According to an exemplary embodiment of one aspect of the present invention, the cable may be anchored at both ends, and a tightening device may be provided in the middle of the cable.

[0018] Furthermore, the tightening device may include a turnbuckle.

[0019] Compared with the prior art, the beneficial effects of this utility model include at least one of the following:

[0020] (1) The novel Bailey beam proposed in this utility model can achieve the goal of improving the load-bearing capacity by adding simple components to the existing Bailey beam. The resulting novel Bailey beam has a simple overall structure and a clear mechanical principle.

[0021] (2) The new Bailey beam proposed in this utility model can effectively solve the problem of insufficient bearing capacity of the current 321 Bailey beam, thus expanding the application scenarios and working conditions of the 321 Bailey beam.

[0022] (3) The new Bailey beam proposed in this utility model mainly utilizes existing Bailey beams, which can avoid the idle waste of the huge inventory of 321 Bailey beams. Attached Figure Description

[0023] The above and other objects and features of this utility model will become clearer from the following description taken in conjunction with the accompanying drawings, wherein:

[0024] Figure 1 A schematic diagram of the structure of the novel Bailey beam of this utility model is shown.

[0025] Explanation of key figure labels:

[0026] 1-Support frame, 2-Anchor seat, 3-Cable, 4-Bailey beam body. Detailed Implementation

[0027] In the following description, a novel Bailey beam of the present invention will be described in detail with reference to the accompanying drawings and exemplary embodiments.

[0028] In the description of this application, it should be understood that the terms "middle," "upper," "lower," "left," "right," "top," "bottom," etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application 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, and therefore should not be construed as a limitation on this application. In the description of this utility model, unless otherwise stated, "several" etc. means two or more. In the description of this application, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed," "connected," and "linked" should be interpreted broadly. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two elements. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood according to the specific circumstances.

[0029] Exemplary Example 1

[0030] This exemplary embodiment provides a novel Bailey beam.

[0031] like Figure 1 As shown in the exemplary embodiment, the novel Bailey beam may include: Bailey beam body 4, support frame 1, cable 3 and anchor 2.

[0032] The lower end of the Bailey bridge body 4 is provided with several support frames 1. The Bailey bridge body 4 may include several Bailey panels connected in sequence, and support frames 1 may be provided at the connection points between the Bailey panels. Here, it is not necessary to provide support frames at every connection point of the Bailey panels; the principle of arrangement is to arrange them symmetrically at the mid-span. Along the length of the Bailey bridge body 4, the principle of arrangement of support frames 1 is to arrange them symmetrically at the mid-span. The height of the support frames 1 is set so that the length gradually decreases from the mid-span to both ends. Specifically, the support frame 1 at the middle of the Bailey bridge body 4 is the tallest, and the height of the support frames 1 decreases from the middle to the left and right ends, and the support frames 1 at the left and right ends of the Bailey bridge body 4 are symmetrically distributed. The free end of the support frame 1 (the end not connected to the Bailey bridge body) may be provided with a cable saddle. The height of the support frame 1 is adjustable. Anchor seats 2 are respectively provided at the left and right ends of the Bailey bridge body 4. The two ends of the cable 3 are respectively passed into the anchor seats 2, and the cable body of the cable 3 passes through the cable saddles on several support frames 1. The cables apply pressure to the cable saddle, thereby transmitting the pressure to the Bailey beam body and enabling the new Bailey beam to withstand pre-bending. The curve shape formed by the cables can be adjusted to meet various load-bearing requirements with less cable force.

[0033] In this exemplary embodiment, the Bailey beam body may include 321 Bailey beams.

[0034] In this exemplary embodiment, a hydraulic or mechanical jack can be installed on the support frame to extend it and adjust its height. The support frame is an adjustable-height support frame, designed as a telescopic structure, which can be achieved through hydraulic and mechanical means. The principle for setting the height of the support frame is that the length gradually decreases from the mid-span to both ends, while the height needs to be symmetrical about the mid-span. The specific height variation will be affected by factors such as the span, and will be determined using finite element analysis for specific projects.

[0035] In this exemplary embodiment, the cable is anchored at both ends of the Bailey beam body, and a tightening device may be provided in the middle of the cable to apply tension to the cable.

[0036] Furthermore, the tightening device may include a turnbuckle.

[0037] In this exemplary embodiment, the cable may include prestressed steel strand.

[0038] In this exemplary embodiment, the function of the anchor may include: serving as a force-bearing point for cable tensioning, connecting to the end of the Bailey beam, and transmitting the force of the cable to the Bailey beam body; any component that performs this function can be applied to both ends of the Bailey beam body, and is not limited to the anchor.

[0039] In this exemplary embodiment, the size of a single Bailey panel can be 2 to 4m in length, for example 3m, and 1 to 2m in height, for example 1.5m. The ends can be designed as male and female ends. When connecting Bailey panels, the male end is inserted into the female end, and then a steel pin is inserted laterally to extend and assemble them into the Bailey beam body.

[0040] Furthermore, the anchor can be connected to the male / female head via a steel pin.

[0041] In this exemplary embodiment, the arrangement, spacing, and height of the support frames are symmetrical about the mid-span of the Bailey beam. The spacing between them can be determined through finite element analysis based on the total length of the Bailey beam and the specifications of the cables, and is not specifically limited.

[0042] In this exemplary embodiment, pre-tension and loading can be applied in stages during construction, which may minimize the force on the supporting structure of the new Bailey beam. For example, Method 1: A through-hole jack can be installed at one or both anchorages to apply tension. This is the optimal method. Method 2: The cable is anchored at both ends, and a tightening device is installed in the middle of the cable to apply tension. Method 3: The cable is anchored at both ends to the anchorages, and the support frame is extended, increasing the height of the frame, thereby indirectly tauting the cable.

[0043] The core principle of this invention is based on the "tensioned cable beam" theory. Considering the current large inventory of 321 Bailey beams, but their load-bearing capacity gradually failing to meet requirements, and the emergence of alternatives such as HD200, XT300, and "super Bailey beams," strengthening the 321 Bailey beams requires auxiliary measures. The innovations are mainly: 1. Setting up support frames at the Bailey panel connection points; 2. Setting anchors at both ends of the Bailey beam; 3. Setting tension cables along the top of the support frame and transmitting the cables to the anchors; 4. Applying cable force to the cables; Method 1: tensioning the cables at the anchors; Method 2: extending the support frame via hydraulic or mechanical jacks; 5. By adjusting the cables to form a curved shape, the optimal form for various load applications can be achieved, meeting load-bearing requirements under relatively small cable forces.

[0044] The principle of this invention includes: the force mechanism of the newly formed Bailey beam structure is that by applying pretension to the lower cables, the Bailey beam body generates a counter-deflection, reducing the final deflection of the structure under load. Meanwhile, the support frame provides elastic support to the Bailey beam body, improving the structural performance. The Bailey beam body, cables, and support frame form a self-balancing system, altering the internal force distribution and fully utilizing the high tensile strength of the high-strength cables, thereby improving the overall structural performance. This allows the Bailey beam body and cables to complement each other, working synergistically to achieve self-balance and fully utilize the role of each structural element. If appropriate pretension and loading are applied in stages during construction, the force on the supporting structure can be minimized.

[0045] In summary, the beneficial effects include:

[0046] This utility model provides a novel Bailey bridge, primarily for use in bridge engineering. The beneficial effects and advantages of this utility model are mainly reflected in five aspects: 1. By adding simple components to a 321 Bailey bridge, the load-bearing capacity can be improved; the overall structure is simple and the mechanical principles are clear. 2. This utility model effectively solves the current problem of insufficient load-bearing capacity in 321 Bailey bridges, expanding the application scenarios and working conditions of 321 Bailey bridges and avoiding the waste of the large inventory of 321 Bailey bridges. 3. The method of forming the novel Bailey bridge using this utility model is simple, easy for construction workers to learn and master, and has low promotion and application costs. 4. The novel Bailey bridge formed by this utility model is simple, its components and equipment are readily available, and centralized intelligent control can be achieved through electrical systems, hydraulic systems, stress sensors, displacement sensors, and information technology, laying a good foundation for integration into digital infrastructure engineering. 5. Under the existing industrial system, the conventional or production difficulty of each component is low, the production cost is controllable, and the prospects for promotion and application are broad.

[0047] Although a novel Bailey beam of the present invention has been described above in conjunction with exemplary embodiments, those skilled in the art should understand that various modifications and changes can be made to the exemplary embodiments of the present invention without departing from the spirit and scope defined by the claims.

Claims

1. A novel Bailey beam, characterized in that, The novel Bailey bridge includes: a Bailey bridge body, a support frame, cables, and anchorages, wherein, The lower end of the Bailey bridge body is equipped with several support frames. Along the length of the Bailey bridge body, the support frames are arranged symmetrically at the mid-span, and the height of the support frames gradually decreases from the mid-span to both ends. The height of the support frames is adjustable. Anchor seats are set at both ends of the Bailey bridge body. The cables are passed through the anchor seats at both ends, and the cables pass through the free ends of the support frames.

2. The novel Bailey beam according to claim 1, characterized in that, The Bailey beam body comprises 321 Bailey beams.

3. The novel Bailey beam according to claim 1, characterized in that, The Bailey beam body includes several Bailey panels connected in sequence, and a support frame is provided at the connection position between the Bailey panels.

4. The novel Bailey beam according to claim 3, characterized in that, The dimensions of a single Bailey panel are: length 2-4m, height 1-2m.

5. The novel Bailey beam according to claim 1, characterized in that, The support frame is equipped with a cable saddle at its free end.

6. The novel Bailey beam according to claim 1, characterized in that, The cable includes prestressed steel strands.

7. The novel Bailey beam according to claim 1, characterized in that, The anchor is connected to the Bailey beam body by a steel pin.

8. The novel Bailey beam according to claim 1, characterized in that, A through-hole jack is provided at one or both ends of the Bailey beam body at the anchor position.

9. The novel Bailey beam according to claim 1, characterized in that, The cable is anchored at both ends, and a tightening device is provided in the middle of the cable.

10. The novel Bailey beam according to claim 9, characterized in that, The tightening device includes a turnbuckle.

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