Hoisting device, hoisting structure and hoisting method for concrete cross beam of through arch bridge

Abstract

The invention relates to the technical field of bridge construction, in particular to a through arch bridge concrete cross beam hoisting device, hoisting structure and method.The device comprises a steel support, the steel support is detachably connected to the side end face of a prefabricated cross beam, a lifting lug is arranged on the top face of the steel support, and the axial direction of a hoisting hole of the lifting lug is arranged in the transverse bridge direction; the distance between the lifting lugs and the transverse axis of the prefabricated cross beam is larger than the distance between the transverse axes of the arch ribs, the mounting height of the lifting lugs is lower than the top face of the prefabricated cross beam, and the bottom face position of the steel support is matched with the bottom face position of the prefabricated cross beam. The situation that a lifting appliance and a sling are stressed unevenly in the lifting process is avoided, the safety in the lifting process is greatly improved, even if auxiliary measures need to be installed, a beam body does not need to be contacted, repeated installation and detachment are not needed when the lifting appliance is installed on the lifting device, the installation efficiency is improved, the lifting period is shortened, and the lifting device can be repeatedly used; the steel investment is reduced, and the construction cost is saved.

Description

Technical Field

[0001] This invention relates to the field of bridge construction technology, and in particular to a hoisting device, hoisting structure and method for concrete crossbeams of a deck arch bridge. Background Technology

[0002] The main construction approach for the long-span arch bridge is "arch first, beams later," using cable cranes for installation. First, the arch ribs are hoisted using a cable crane. After the arch ribs are installed, the hangers are installed, then the I-beam lattice steel beams are hoisted (with the hangers initially tensioned simultaneously). Next, the precast bridge deck slabs are hoisted and wet joints are constructed. Finally, the bridge deck and ancillary structures are constructed, completing the entire bridge construction.

[0003] Because the construction method of "arch first, beam later" is adopted, with the bridge deck installed only after the arch ribs are completed, traditional hoisting methods have certain shortcomings. For example, when using pre-embedded lifting rings, the lifting point must be set on the crossbeam. During the hoisting process, the already installed arch ribs and cross braces can obstruct the lifting cables, making it difficult to reach the designed position. When using the overall hoisting method, the wire rope needs to be hooked onto the precast beam, with rubber pads placed at the contact points between the beam and the wire rope. During the hoisting process, the already installed arch ribs and cross braces can again obstruct the lifting cables, making it impossible to accurately reach the designed position. Furthermore, it is difficult to determine the center of gravity when using the wire rope hook hoisting method, posing a risk of overall slippage and a high safety hazard. Summary of the Invention

[0004] The purpose of this invention is to solve the problem in the prior art of constructing a through-arch bridge by first arching and then beaming, where the hoisting cable is blocked by the already installed arch ribs and cross braces during the hoisting process, making it difficult to reach the designed position. The invention provides a hoisting device, hoisting structure, and method for the concrete cross beams of a through-arch bridge.

[0005] To achieve the above objectives, the technical solution adopted by the present invention is as follows: In a first aspect, a hoisting device for a concrete crossbeam of a deck arch bridge is provided, comprising a steel support, wherein the steel support is detachably connected to the side end face of the precast crossbeam, the top surface of the steel support is provided with a lifting lug, the axial direction of the lifting hole of the lifting lug is arranged along the transverse direction of the bridge, the distance between the lifting lug and the transverse axis of the precast crossbeam is greater than the distance between the transverse axes of the arch rib, the installation height of the lifting lug is lower than the top surface of the precast crossbeam, and the bottom surface position of the steel support is adapted to the bottom surface position of the precast crossbeam.

[0006] The transverse axis is the central axis of the component in the transverse direction of the bridge. The transverse length of the steel support (i.e., the length extending beyond the side of the crossbeam) is set according to actual requirements.

[0007] The steel bracket is used to set the lifting lugs on the side end face of the precast crossbeam, so that the lifting lugs can avoid the arch ribs and cross braces installed above, and the position of the lifting lugs is kept within the height range of the precast crossbeam. The steel bracket can easily meet the stress requirements and improve the accuracy of the lifting lug assembly.

[0008] The hoisting device for the concrete crossbeam of a lower-bearing arch bridge described in this invention uses lifting lugs on a support frame to position the lifting points on the outer side of the precast crossbeam. This allows for horizontal lifting using vertical slings while avoiding the already installed arch ribs and cross braces. The height of the lifting lugs remains within the height range of the precast crossbeam, which helps reduce the risk of deformation during horizontal hoisting. Installing the lifting points on an external support frame, compared to pre-embedding the lifting lugs on the precast crossbeam, helps ensure the fixed positions of the lifting points on both sides, resulting in smaller distance deviations between the sides and the center of gravity. This avoids uneven stress on the lifting equipment and slings during hoisting, significantly improving safety. Even if auxiliary measures need to be installed, they do not need to contact the beam. Installation on this hoisting device does not require repeated installation and disassembly, which helps improve installation efficiency, shorten the hoisting period, and the hoisting device can be reused, saving construction costs.

[0009] Preferably, the steel support includes two unit components, the joint between the two unit components is arranged along the transverse direction of the bridge, the lifting lug is provided at the joint and is respectively connected to the two unit components, and both ends of the two unit components are provided with connecting plates. The steel support is connected to the precast crossbeam through one of the connecting plates.

[0010] By adopting the above configuration, the lifting process is always carried out by multiple components sharing the load, which can be distributed among two unit components. The force transmission path is clear, avoiding the problem of excessive deformation of the steel support formed by a single component during the lifting process.

[0011] Preferably, the unit component is an I-beam.

[0012] It has good structural symmetry and is easy to splice the top surface to connect the lifting lugs.

[0013] Preferably, stiffening plates are provided between the unit component and the connecting plates on both sides.

[0014] Preferably, the connecting plate is provided with bolt holes for connecting the precast crossbeam at the locations corresponding to the unit component and the stiffening plate.

[0015] Preferably, the steel support is detachably connected by a pre-embedded climbing cone in the precast beam, and the pre-embedded climbing cone is welded to the reinforcing steel in the precast beam.

[0016] Preferably, the lifting lugs are provided with stiffening ribs on both sides.

[0017] Preferably, the lifting lug has a flange along the circumference of the lifting hole.

[0018] Secondly, a hoisting structure for a concrete crossbeam of an arch bridge is provided, including a precast crossbeam. Both sides of the precast crossbeam are provided with a hoisting device for a lower-bearing arch bridge concrete crossbeam as described above, and the structure and dimensions of the hoisting devices on both sides are the same.

[0019] The hoisting structure for the concrete crossbeam of an arch bridge described in this invention results in more uniform stress distribution, more reliable hoisting, and higher hoisting safety during the hoisting process.

[0020] Thirdly, a method for hoisting concrete crossbeams of a deck arch bridge is provided, comprising the following steps: S1. Transport the precast crossbeams to the bridge site; S2. Lower the sling to the lifting position. The sling is connected to a lifting device for a concrete crossbeam of a lower-bearing arch bridge as described above. S3. Connect the corresponding hoisting devices to both ends of the precast crossbeam; S4. Raise the precast crossbeam to the designed height and connect it to the hanger rod; S5. Remove the hoisting device to complete the hoisting of the crossbeam.

[0021] The method for hoisting concrete crossbeams of a lower-bearing arch bridge described in this invention allows the hoisting device and slings to remain connected, accelerating the connection process. The position of the crossbeam is adjusted with reference to the natural lowering position of the slings before reconnecting the hoisting device, reducing the impact of deformation on the hoisting process. This method results in good hoisting and installation performance, more uniform stress distribution, and facilitates quick and accurate arrival at the designed position.

[0022] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are: 1. The hoisting device for the concrete crossbeam of a lower-bearing arch bridge described in this invention uses lifting lugs on a support frame to position the lifting points on the outer side of the precast crossbeam. This allows for horizontal hoisting using vertical slings while avoiding the already installed arch ribs and cross braces. The height of the lifting lugs is maintained within the height range of the precast crossbeam, which helps reduce the risk of deformation during horizontal hoisting. Installing the lifting points on an external support frame, compared to pre-embedding the lifting lugs on the precast crossbeam, helps ensure the fixed positions of the lifting points on both sides, resulting in smaller distance deviations between the sides and the center of gravity. This avoids uneven stress on the lifting tools and slings during hoisting, significantly improving safety during the hoisting process. Even if auxiliary measures need to be installed, they do not need to contact the beam. Installation on this hoisting device does not require repeated installation and disassembly, which helps improve installation efficiency, shorten the hoisting period, and the hoisting device can be reused, saving construction costs.

[0023] 2. The hoisting structure for the concrete crossbeam of an arch bridge described in this invention results in more uniform stress distribution, more reliable hoisting, and higher hoisting safety during the hoisting process.

[0024] 3. The method for hoisting concrete crossbeams of a lower-bearing arch bridge described in this invention allows the hoisting device and slings to remain connected, accelerating the connection efficiency. The position of the crossbeam is adjusted with reference to the natural lowering position of the slings before connecting the hoisting device, reducing the deformation impact on the hoisting process. This results in good hoisting and installation performance, more uniform stress distribution, and easier and faster and more accurate arrival at the design position. Attached Figure Description

[0025] Figure 1 This is a three-dimensional structural schematic diagram of a hoisting device for a concrete crossbeam of a lower-bearing arch bridge according to Embodiment 1. Figure 2 This is a front view schematic diagram of a hoisting device for a concrete crossbeam of a bridge with under-deck arch in Embodiment 1. Figure 3 This is a side view schematic diagram of a hoisting device for a concrete crossbeam of a bridge with under-deck arch, as described in Example 1. Figure 4 This is a top view schematic diagram of a hoisting device for a concrete crossbeam of a bridge with under-deck arch, as described in Example 1. Figure 5 This is a schematic diagram of the installation of a hoisting device for a concrete crossbeam of a deck arch bridge according to Embodiment 1. Figure 6 This is a schematic diagram of the hoisting method for the concrete crossbeam of a lower-bearing arch bridge according to Example 3.

[0026] Icons: 01-Precast crossbeam, 011-Embedded climbing cone, 02-Arch rib, 03-Arch rib cross brace, 04-Lifting cable, 1-Steel bracket, 11-Unit component, 12-Connecting plate, 121-Bolt hole, 13-Stiffening plate, 2-Lifting lug, 21-Stiffening rib, 22-Flange. Detailed Implementation

[0027] The present invention will now be described in detail with reference to the accompanying drawings.

[0028] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0029] Example 1 like Figures 1-6As shown, the hoisting device for a concrete crossbeam of a lower-bearing arch bridge used in this invention includes a steel support 1. The steel support 1 is detachably connected to the side end face of the precast crossbeam 01. The top surface of the steel support 1 is provided with a lifting lug 2. The axial direction of the lifting hole of the lifting lug 2 is set along the transverse direction of the bridge. The distance between the lifting lug 2 and the transverse axis of the precast crossbeam 01 is greater than the distance between the transverse axes of the arch rib 02. The installation height of the lifting lug 2 is lower than the top surface of the precast crossbeam 01. The bottom surface position of the steel support 1 is adapted to the bottom surface position of the precast crossbeam 01.

[0030] Specifically, this embodiment only illustrates that the steel support 1 includes two unit components 11, each of which is an I-beam. The joint between the two unit components 11 is set along the transverse direction of the bridge, that is, along the longitudinal direction of the precast beam 01. The lifting lugs 2 are located at the joint on the top surface of the steel support 1 and are respectively connected to the two unit components 11. Both ends of the two unit components 11 are provided with connecting plates 12 to further improve the stability of the steel support 1 and prevent deformation. The steel support 1 is connected to the precast beam 01 through one of the connecting plates 12. The connecting plate 12 can be detachably connected by a pre-embedded climbing cone 011, which is welded to the reinforcing steel in the precast beam 01. A stiffening plate 13 is provided between the bottom surface of each unit component 11 and the connecting plates 12 on both sides. The stiffening plate 13 can be set as a plate with a triangular cross section, and the plate is set vertically corresponding to the web of the I-beam. The connecting plate 12 is provided with bolt holes 121 for connecting the pre-embedded climbing cone 011 at the positions corresponding to the unit component 11 and the stiffening plate 13.

[0031] Lifting lug 2 is installed along the longitudinal direction of the bridge. Stiffening ribs 21 are provided on both sides of lifting lug 2. Flanges 22 are provided along the circumference of the lifting hole of lifting lug 2. The distance between lifting lug 2 and the transverse axis of precast crossbeam 01 is greater than the distance between the transverse axes of arch rib 02. (Refer to...) Figure 6 As shown, avoid interference from arch rib 02.

[0032] like Figures 5-6 As shown, after the hoisting device is connected to the side section of the precast beam 01, the top surface of the lifting lug 2 is lower than the top surface of the precast beam 01, and the bottom surface of the hoisting device is higher than the top surface of the precast beam 01, which further facilitates the stability of the hoisting process and reduces the risk of deformation during the hoisting process.

[0033] In some alternative implementations, the steel support 1 can be formed by splicing two channel steel unit parts 11 together, or it can be made directly from square steel as the steel support 1, depending on the actual lifting weight, size, environment, etc.

[0034] In some alternative implementations, the connecting plates 12 can be connected by high-strength bolts or by setting embedded plates in the precast beams 01.

[0035] The hoisting device for the concrete crossbeam of a lower-bearing arch bridge described in this invention uses lifting lugs on a support frame to position the lifting points on the outer side of the precast crossbeam. This allows for horizontal lifting using vertical slings while avoiding the already installed arch ribs and cross braces. The height of the lifting lugs remains within the height range of the precast crossbeam, which helps reduce the risk of deformation during horizontal hoisting. Installing the lifting points on an external support frame, compared to pre-embedding the lifting lugs on the precast crossbeam, helps ensure the fixed positions of the lifting points on both sides, resulting in smaller distance deviations between the sides and the center of gravity. This avoids uneven stress on the lifting equipment and slings during hoisting, significantly improving safety. Even if auxiliary measures need to be installed, they do not need to contact the beam. Installation on this hoisting device does not require repeated installation and disassembly, which helps improve installation efficiency, shorten the hoisting period, and the hoisting device can be reused, saving construction costs.

[0036] Example 2 The present invention describes a hoisting structure for a concrete crossbeam of an arch bridge, referring to... Figures 1-6 As shown, it includes a precast crossbeam 01. Both sides of the precast crossbeam 01 are equipped with a hoisting device for a concrete crossbeam of a lower-bearing arch bridge as described in Example 1. The structure and dimensions of the hoisting devices on both sides are the same.

[0037] The hoisting structure for the concrete crossbeam of an arch bridge described in this invention results in more uniform stress distribution, more reliable hoisting, and higher hoisting safety during the hoisting process.

[0038] Example 3 The present invention discloses a method for hoisting concrete crossbeams of a deck arch bridge, such as... Figures 1-6 As shown, it includes the following steps: S1. Transport the precast crossbeam 01 to the bridge site; S2. Lower the sling 04 to the lifting position. The sling 04 is connected to a lifting device for a concrete crossbeam of a lower-bearing arch bridge as described in Example 1. S3. Connect the corresponding hoisting devices to both ends of the precast crossbeam 01; S4. Raise the precast crossbeam 01 to the designed height and connect it to the hanger rod; S5. Remove the hoisting device to complete the hoisting of the crossbeam.

[0039] The precast crossbeam 01 can be transported to the bridge site by waterway via a transport ship. The sling 04 under the cable system is positioned to lift the precast crossbeam 01. The sling 04 can be arranged on the outside of the arch rib 02, corresponding to the position of the lifting lug 2, without being interfered with by the arch rib 02 and the arch rib cross brace 03. The sling 04 can be detachably connected to the lifting device through a shackle. The lifting device maintains its connection with the sling 04, which is equivalent to part of the lifting system. The position of the precast crossbeam 01 is adjusted by the transport ship, and then the precast crossbeam 01 is hooked by bolting the pre-embedded climbing cone 011. Then, the sling 04 is lifted to raise the precast crossbeam 01 to the design height. The lifting rod is inserted into the lifting rod hole of the crossbeam, and the alignment and elevation of the beam are adjusted. Finally, the lifting device is removed to complete the lifting construction of the precast crossbeam.

[0040] This device can be used to hoist several precast beams of the entire bridge. Each precast beam does not need to be equipped with a separate hoisting structure, which enhances the recycling of the hoisting device. Unlike the traditional method, the hoisting structure is not directly embedded on the top surface of the beam, so it is less likely to damage the appearance quality of the precast beam. The hoisting balance is also better.

[0041] The method for hoisting concrete crossbeams of a lower-bearing arch bridge described in this invention allows the hoisting device and slings to remain connected, accelerating the connection process. The position of the crossbeam is adjusted with reference to the natural lowering position of the slings before reconnecting the hoisting device, reducing the impact of deformation on the hoisting process. This method results in good hoisting and installation performance, more uniform stress distribution, and facilitates quick and accurate arrival at the designed position.

[0042] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A hoisting device for a concrete crossbeam of a deck arch bridge, characterized in that, The system includes a steel support (1), which is detachably connected to the side end face of the precast crossbeam (01). The top surface of the steel support (1) is provided with a lifting lug (2). The axial direction of the lifting hole of the lifting lug (2) is set along the transverse direction of the bridge. The distance between the lifting lug (2) and the transverse axis of the precast crossbeam (01) is greater than the distance between the transverse axis of the arch rib (02). The installation height of the lifting lug (2) is lower than the top surface of the precast crossbeam (01). The bottom surface position of the steel support (1) is adapted to the bottom surface position of the precast crossbeam (01).

2. The hoisting device for the concrete crossbeam of a deck arch bridge according to claim 1, characterized in that, The steel support (1) includes two unit components (11), the joint of the two unit components (11) is set along the transverse direction of the bridge, the lifting lug (2) is set at the joint and connected to the two unit components (11) respectively, and the two unit components (11) are provided with connecting plates (12) at both ends. The steel support (1) is connected to the precast crossbeam (01) through one of the connecting plates (12).

3. The hoisting device for the concrete crossbeam of a deck arch bridge according to claim 2, characterized in that, The unit component (11) is an I-beam.

4. The hoisting device for a concrete crossbeam of a deck arch bridge according to claim 2, characterized in that, A stiffening plate (13) is provided between the unit component (11) and the connecting plates (12) on both sides.

5. The hoisting device for a concrete crossbeam of a deck arch bridge according to claim 4, characterized in that, The connecting plate (12) is provided with bolt holes (121) for connecting the precast crossbeam (01) at the locations corresponding to the unit component (11) and the stiffening plate (13).

6. A hoisting device for a concrete crossbeam of a deck arch bridge according to any one of claims 1-5, characterized in that, The steel support (1) is detachably connected by a pre-embedded climbing cone (011) in the prefabricated crossbeam (01), and the pre-embedded climbing cone (011) is welded to the reinforcing steel in the prefabricated crossbeam (01).

7. A hoisting device for a concrete crossbeam of a deck arch bridge according to any one of claims 1-5, characterized in that, The lug (2) is provided with stiffening ribs (21) on both sides.

8. A hoisting device for a concrete crossbeam of a deck arch bridge according to any one of claims 1-5, characterized in that, The lifting lug (2) has a flange (22) along the circumference of the lifting hole.

9. A hoisting structure for a concrete crossbeam of an arch bridge, characterized in that, The precast crossbeam (01) is provided on both sides of the precast crossbeam (01) with a hoisting device for a concrete crossbeam of a lower-bearing arch bridge as described in any one of claims 1-8. The hoisting devices on both sides have the same structure and dimensions.

10. A method for hoisting concrete crossbeams of a deck-type arch bridge, characterized in that, Includes the following steps: S1. Transport the precast crossbeam (01) to the bridge site; S2. Lower the sling (04) to the lifting position. The sling (04) is connected to a hoisting device for a concrete crossbeam of a lower-bearing arch bridge as described in any one of claims 1-8. S3. Adjust the position of the precast beam (01) and connect the corresponding hoisting device to both ends of the precast beam (01); S4. Raise the precast crossbeam (01) to the designed height and connect it to the hanger rod; S5. Remove the hoisting device to complete the hoisting of the crossbeam.

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