Temporary pier support for operation in special environments

Abstract

This invention relates to the field of bridge supports and discloses a temporary pier support for operation in special environments. The support includes a support body, jacks, and an elastic buffer device. The jacks are positioned on top of the support body, and the elastic buffer device is positioned higher than the jacks. The elastic buffer device contacts the steel box girder before the jacks, and after the steel box girder is lowered to a predetermined height, the elastic buffer device works with the crane to keep the steel box girder in a relatively static state. When the crane releases the steel box girder, the elastic buffer device works with the jacks to support the steel box girder. By setting the elastic buffer device higher than the jacks, the kinetic energy of the steel box girder's descent can be absorbed before it contacts the support, significantly reducing the instantaneous impact force and preventing damage to the support structure. Furthermore, the elastic buffer device can prevent problems such as local deformation and loosening of joints caused by impact, ensuring structural stability throughout the hoisting operation.

Description

Technical Field

[0001] This invention relates to the field of bridge support structures, and more particularly to a temporary pier support structure for operation in special environments. Background Technology

[0002] The superstructure of a cross-sea cable-stayed bridge faces wind-induced vibration during typhoon season construction. Erecting temporary rigid piers can help suppress forced buffeting during the large cantilever phase. However, erecting temporary rigid piers under the steel box girder in the sea can cause problems with the berthing of ships during the erection of the steel box girder. If the steel box girder is stored on a 60m high temporary pier in advance, the temporary rigid pier is prone to stability problems in the longitudinal direction of the bridge due to wind vibration.

[0003] To address this, temporary pier supports can be added to improve stability. In actual hoisting, the top surface of the temporary supports is usually equipped with multiple jacks. When the steel box girder is lowered into contact with these jacks, since the bottom surface of the steel box girder is not a perfectly flat surface, it cannot be guaranteed that all jacks can support the steel box girder at the same time. When the steel box girder is placed on the support, it will impact the support structure or the jacks on the support structure with a certain residual velocity, which will generate a significant instantaneous impact force. This impact force is much higher than the static weight of the steel box girder, which may cause local deformation of the support structure, loosening of connection nodes, or even overall instability.

[0004] If each jack is raised individually to actively contact the steel box girder, a corresponding detection device needs to be set on each jack, and a corresponding system needs to be introduced for calculation and control. Even if the detection device and control system are invested in regardless of cost, it is impossible to guarantee that the surface of the steel box girder in contact with all the jacks is flat. Once the crane releases the steel box girder, it will still cause impact to some of the jacks. Therefore, there is an urgent need for a device that can buffer the impact and protect the support structure and the steel box girder body at the moment the steel box girder contacts the support. Summary of the Invention

[0005] The purpose of this invention is to provide a temporary pier support for operations in special environments to solve the problem that traditional temporary supports, when bearing steel box girders, lack corresponding buffer devices, causing the steel box girder to directly impact the support structure or the jacks installed on the support structure when placed on it, generating significant instantaneous impact force, causing local deformation of the support structure, loosening of connection nodes, or even overall instability. The specific technical solution is as follows:

[0006] A temporary support frame for operation in special environments, used for hoisting steel box girders, includes a support body, jacks, and an elastic buffer device. The jacks are located on top of the support body, and the elastic buffer device is located above the jacks. The elastic buffer device abuts against the steel box girder before the jacks, and after the steel box girder is lowered to a predetermined height, the elastic buffer device works with the crane to keep the steel box girder in a relatively static state. When the crane releases the steel box girder, the elastic buffer device works with the jacks to jointly support the steel box girder.

[0007] As an improvement to the above technical solution, the top surface of the steel box girder that the elastic buffer device contacts is 0.1-1 cm higher than the lifting surface of the jack.

[0008] As an improvement to the above technical solution, the elastic buffer device includes two driving mechanisms disposed on both sides of the support body and a bearing portion pulled from both sides by the two driving mechanisms. The top surface of the support body is provided with a guide post, and the bottom surface of the bearing portion is provided with an opening for receiving the guide post.

[0009] As an improvement to the above technical solution, the drive mechanism includes a base, a traction wheel, a traction rope, and a motor. The base is connected to the support body and has a protrusion that is higher than the support body. The traction wheel is rotatably connected to the protrusion. The motor is connected to the base. One end of the traction rope is connected to the bearing part, and the other end of the traction rope is connected to the output end of the motor.

[0010] As an improvement to the above technical solution, the support body includes a plurality of intermediate supports and an end support. The plurality of intermediate supports are arranged side by side and are detachably connected to each other. The end support is detachably connected to either end of the intermediate supports.

[0011] As an improvement to the above technical solution, a roller is rotatably connected to the bottom of the intermediate support or the end support.

[0012] As an improvement to the above technical solution, the support body is connected to an elastic telescopic rod, which can extend to contact the ground and thus fix the support body.

[0013] As an improvement to the above technical solution, the base is provided with a trigger assembly for squeezing the elastic telescopic rod. The trigger assembly includes a bent rotating member and a rotating wheel. The rotating wheel is rotatably connected to one end of the rotating member, and the rotating wheel outwardly supports part of the traction rope between the motor and the traction wheel. The top end of the elastic telescopic rod is located on the rotation path at the other end of the rotating member.

[0014] As an improvement to the above technical solution, the rotating component includes a first branch segment and a second branch segment, with an obtuse angle between the first branch segment and the second branch segment. The first branch segment is used to connect the rotating wheel, and the second branch segment is used to trigger the elastic telescopic rod.

[0015] As an improvement to the above technical solution, a spring is provided between the base and the outer side of the first branch section. When the elastic buffer device is unloaded, the spring cooperates with the rotating part to push out part of the traction rope.

[0016] The beneficial effects of this invention are as follows: By setting an elastic buffer device higher than the jack, the kinetic energy of the steel box girder's descent can be absorbed before it contacts the support, significantly reducing the instantaneous impact force and preventing damage to the support structure. Secondly, the elastic buffer device can prevent problems such as local deformation and loosening of joints caused by impact, ensuring the structural stability of the entire hoisting operation. Finally, the elastic buffer device, in conjunction with the crane, keeps the steel box girder stable after contacting the support, which helps with subsequent jack adjustment and precise positioning. The overall structure is simple and easy to install, and it is suitable for steel box girder hoisting projects under various terrain and climate conditions, especially for special operating environments such as high wind speed and high altitude.

[0017] The support structure can be modularly combined according to steel box girders of different spans and weights, and can be flexibly moved to designated locations on the construction site, significantly improving construction efficiency and applicability.

[0018] After the elastic telescopic rod contacts the ground, it increases the friction between the support body and the ground, preventing the support from sliding or becoming unstable during hoisting. The elastic telescopic rod can automatically extend according to the change in the force of the traction rope, realizing immediate reinforcement of the support body and avoiding the risk of support displacement or overturning caused by external disturbances. In special environments such as high wind speed or uneven ground, this device can effectively enhance the wind resistance and adaptability of the support, and improve the safety margin of hoisting operations.

[0019] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Of course, implementing any product or method of this application does not necessarily require achieving all of the advantages described above at the same time. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of the present invention 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 some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a schematic diagram of the structure of the present invention.

[0022] Figure 2 This is a schematic diagram of the structure of the support body of the present invention.

[0023] Figure 3 This is another structural schematic diagram of the support body of the present invention.

[0024] Figure 4 This is a schematic diagram of the rotating component of the present invention.

[0025] In the diagram: 1. Steel box girder; 2. Support body; 3. Elastic buffer device; 4. Jack; 5. Roller; 6. Elastic telescopic rod; 11. Intermediate support; 12. End support; 31. Base; 32. Traction wheel; 33. Rotating component; 34. Motor; 35. Traction rope; 36. Bearing part; 37. Rotating wheel; 38. Guide column; 39. Spring. Detailed Implementation

[0026] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0027] The superstructure of a cable-stayed bridge across the sea is susceptible to wind-induced vibrations during construction, especially when the main girder is in a large cantilever state, which may result in significant forced buffeting. To address this issue, the conventional practice is to install temporary rigid piers during construction to enhance structural stability.

[0028] When using traditional temporary supports to support steel box girder 1, if the steel box girder is stored in advance on a temporary pier 60m high, the temporary rigid pier is prone to stability problems in the longitudinal direction of the bridge due to wind vibration. In addition, due to the lack of corresponding buffer devices, when the steel box girder 1 is placed on the support, it will directly impact the support structure or the jacks 4 set on the support structure, generating significant instantaneous impact force, causing local deformation of the support structure, loosening of connection nodes, or even overall instability. Furthermore, since the temporary pier has a variable height, the temporary pier support needs to be adapted.

[0029] Please see Figures 1-4This invention provides a temporary support frame for operation in special environments to solve the above problems. It is mainly used for hoisting steel box girder 1. Specifically, it includes a support body 2, a jack 4 and an elastic buffer device 3. The jack 4 is set on the top of the support body 2, and the elastic buffer device 3 is set higher than the jack 4. The elastic buffer device 3 abuts against the steel box girder 1 before the jack 4. After the steel box girder 1 is lowered to a predetermined height, the elastic buffer device 3 works with the crane to keep the steel box girder 1 in a relatively static state. When the crane releases the steel box girder 1, the elastic buffer device 3 works with the jack 4 to jointly support the steel box girder 1.

[0030] The support body 2 is used to bear the overall weight of the steel box girder 1 and provide a stable support foundation, while the jack 4 is used to adjust the installation height of the steel box girder 1. During the slow lowering of the steel box girder 1 by the crane, when it approaches the top of the support body 2, the elastic buffer device 3 first contacts the bottom of the steel box girder 1, providing initial support and preventing the steel box girder 1 from swaying in the air. Subsequently, as the crane continues to slowly lower the steel box girder 1, the elastic buffer device 3 works with the crane to control the descent speed of the steel box girder 1, keeping it relatively stationary within a predetermined height range, thus achieving a smooth transition. Once the steel box girder 1 is completely stable, the jack 4 begins to bear the force while the crane releases the steel box girder 1. The jack 4 and the elastic buffer device 3 jointly bear the entire weight of the steel box girder 1. The fine-tuning and positioning of the steel box girder 1 or subsequent beam lowering operations can be completed by adjusting the jack 4.

[0031] By setting an elastic buffer device 3 higher than the jack 4, the kinetic energy of the steel box girder 1 before it contacts the support can be absorbed, significantly reducing the instantaneous impact force and avoiding damage to the support structure. Secondly, the setting of the elastic buffer device 3 can prevent problems such as local deformation of the support and loosening of nodes caused by impact, ensuring the structural stability of the entire hoisting operation. Finally, the elastic buffer device 3, together with the crane, keeps the steel box girder 1 in a stable state after contacting the support, which helps the subsequent adjustment and precise positioning of the jack 4. The overall structure is simple and easy to install, and it is suitable for steel box girder 1 hoisting projects under various terrain and climate conditions, especially suitable for special working environments such as high wind speed and high altitude.

[0032] When the support is in its initial state, the top contact surface of the elastic buffer device 3 is slightly higher than the working support surface of the jack 4, so that the steel box girder 1 first contacts the elastic buffer device 3 during the lowering process, instead of directly acting on the jack 4. Therefore, a corresponding height difference needs to be designed. Preferably, the top surface of the steel box girder 1 that the elastic buffer device 3 contacts is 0.1-1cm higher than the lifting surface of the jack 4. Through this height difference design, it can be ensured that in the initial stage of the steel box girder 1's placement, its weight is preferentially borne by the elastic buffer device 3, thereby giving full play to its shock absorption and energy absorption function. After the speed of the steel box girder 1 tends to stabilize, the load is gradually transferred to the jack 4 to achieve a smooth transition from dynamic impact to static bearing.

[0033] In some embodiments, the elastic buffer device 3 includes two drive mechanisms disposed on both sides of the support body 2 and a bearing portion 36 pulled from both sides by the two drive mechanisms. The top surface of the support body 2 is provided with a guide post 38, and the bottom surface of the bearing portion 36 is provided with an opening for receiving the guide post 38, thereby realizing the stable lifting and lowering of the bearing portion 36 in the vertical direction. The opening provided on the bottom surface of the bearing portion 36 cooperates with the guide post 38 to form a vertical guiding structure, effectively preventing the bearing portion 36 from shifting or shaking during the buffering process, and ensuring the stability and reliability of the buffering action.

[0034] In some embodiments, the drive mechanism includes a base 31, a traction wheel 32, a traction rope 35, and a motor 34. The base 31 is connected to the support body 2 and has a protrusion higher than the support body 2. The traction wheel 32 is rotatably connected to the protrusion. The motor 34 is connected to the base 31. One end of the traction rope 35 is connected to the bearing part 36, and the other end of the traction rope 35 is connected to the output end of the motor 34. The motor 34 drives the traction rope 35 to extend and retract, causing the bearing part 36 to move up and down along the guide column 38, thereby achieving dynamic buffer control during the lowering of the steel box girder 1. When the steel box girder 1 approaches the support, the bearing part 36 rises to a predetermined height in advance under the traction of the traction rope 35, preferentially contacting the bottom of the steel box girder 1 and absorbing its descent kinetic energy, thereby effectively reducing the instantaneous impact force borne by the support structure. The motor 34 can adjust the magnitude and direction of the traction force according to the actual hoisting speed and load changes, thereby achieving precise control of the lifting process of the bearing part 36 and improving the adaptability and stability of the buffer performance.

[0035] During the existing steel box girder hoisting construction, traditional temporary supports are usually fixed structures, with components that cannot be disassembled or adjusted, resulting in poor adaptability when dealing with steel box girders of different spans and weights. In addition, the supports are mostly of the form of fixed legs, lacking convenient moving devices, making the operation of the supports cumbersome and labor-intensive during on-site setup, transportation and reuse, which seriously affects the construction progress and work efficiency.

[0036] Therefore, the present invention also provides some embodiments. Specifically, the support body 2 includes a plurality of intermediate supports 11 and an end support 12. The plurality of intermediate supports 11 are arranged side by side and are detachably connected to each other. The end support 12 is detachably connected to either end of the intermediate supports 11, thereby flexibly adjusting the overall length of the support according to actual construction needs.

[0037] Preferably, adjacent intermediate supports 11 and intermediate supports 11 and end supports 12 are stably connected by bolts, pins or other connection structures that facilitate quick installation and disassembly. In addition, a roller 5 assembly with rotatable connection is provided at the bottom of the intermediate support 11 or end support 12, so that the entire support system has good on-site mobility. Through the above structural design, the support can be modularly combined according to steel box girders 1 with different spans and weights, and can be flexibly moved to a designated position on the construction site, significantly improving construction efficiency and applicability.

[0038] Furthermore, temporary supports are typically fixed structures, lacking automatic adjustment and auxiliary stabilization functions. When the steel box girder 1 is lowered onto the supports by a crane, the supports may slip, tilt, or even become unstable due to the influence of instantaneous impact forces, wind loads, uneven ground, and other external factors, thereby threatening construction safety.

[0039] To address the aforementioned issues, the present invention also provides several embodiments. Specifically, the support body 2 is connected to an elastic telescopic rod 6, which can extend to contact the ground and thus fix the support body 2. Preferably, the base 31 is provided with a triggering assembly for pressing the elastic telescopic rod 6. The triggering assembly includes a bent rotating member 33 and a rotating wheel 37. The rotating wheel 37 is rotatably connected to one end of the rotating member 33 and extends outward to support a portion of the traction rope 35 between the motor 34 and the traction wheel 32. The top end of the elastic telescopic rod 6 is positioned on the rotation path of the other end of the rotating member 33. The rotating member 33 includes a first branch segment and a second branch segment, with an obtuse angle between the first branch segment and the second branch segment. The first branch segment is used to connect the rotating wheel 37, and the second branch segment is used to trigger the elastic telescopic rod 6. A spring 39 is provided between the base 31 and the outer surface of the first branch segment. When the elastic buffer device 3 is unloaded, the spring 39 cooperates with the rotating member 33 to extend outward to support a portion of the traction rope 35.

[0040] The specific working principle is as follows: When the bearing part 36 bears the steel box girder 1, the traction rope 35 will be tightened after the bearing part 36 descends. Due to the change in tension of the traction rope 35, the traction rope 35 will apply force to the rotating wheel 37. Since the rotating part 33 used to install the rotating wheel 37 is rotatably connected to the base 31, the traction rope 35 will also drive the rotating part 33 to rotate while squeezing the rotating wheel 37 inward. After the rotating part 33 rotates to a certain angle, the bottom of the rotating part 33 will contact the elastic telescopic rod 6 and drive the elastic telescopic rod 6 to move downward until the bottom of the elastic telescopic rod 6 contacts the ground.

[0041] After the elastic telescopic rod 6 contacts the ground, it increases the friction between the support body 2 and the ground, preventing the support from sliding or becoming unstable during hoisting. The elastic telescopic rod 6 can automatically extend according to the force change of the traction rope 35, realizing the immediate reinforcement of the support body 2 and avoiding the risk of support displacement or overturning caused by external disturbance. In special environments such as high wind speed or uneven ground, this device can effectively enhance the wind resistance and adaptability of the support and improve the safety margin of hoisting operations.

[0042] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within the present invention.

Claims

1. A temporary pier support for operation in a special environment, applied to the hoisting of steel box girders, characterized in that, The system includes a support body, jacks, and an elastic buffer device. The jacks are located on top of the support body, and the elastic buffer device is located above the jacks. The elastic buffer device abuts against the steel box girder before the jacks. After the steel box girder is lowered to a predetermined height, the elastic buffer device works with the crane to keep the steel box girder in a relatively static state. When the crane releases the steel box girder, the elastic buffer device works with the jacks to support the steel box girder. The elastic buffer device includes two drive mechanisms disposed on both sides of the support body and a bearing part pulled from both sides by the two drive mechanisms. The top surface of the support body is provided with a guide post, and the bottom surface of the bearing part is provided with an opening for receiving the guide post. The drive mechanism includes a base, a traction wheel, a traction rope, and a motor. The base is connected to the support body and has a protrusion that is higher than the support body. The traction wheel is rotatably connected to the protrusion. The motor is connected to the base. One end of the traction rope is connected to the bearing part, and the other end of the traction rope is connected to the output end of the motor. The support body is connected to an elastic telescopic rod, which can extend to contact the ground to fix the support body. The base is provided with a trigger assembly for squeezing the elastic telescopic rod. The trigger assembly includes a bent rotating member and a rotating wheel. The rotating wheel is rotatably connected to one end of the rotating member, and the rotating wheel outward supports part of the traction rope between the motor and the traction wheel. The top end of the elastic telescopic rod is located on the rotation path of the other end of the rotating member.

2. The temporary support structure for operation in a special environment according to claim 1, characterized in that: The top surface of the steel box girder that the elastic buffer device contacts is 0.1-1 cm higher than the lifting surface of the jack.

3. The temporary support pier for operation in a special environment according to claim 1, characterized in that: The support body includes a plurality of intermediate supports and an end support. The plurality of intermediate supports are arranged side by side and are detachably connected to each other. The end support is detachably connected to either end of the intermediate supports.

4. A temporary support pier for operation in a special environment according to claim 3, characterized in that: The bottom of the intermediate support or the end support is rotatably connected to a roller.

5. A temporary support pier for operation in a special environment according to claim 4, characterized in that: The rotating component includes a first branch segment and a second branch segment, with an obtuse angle between the first branch segment and the second branch segment. The first branch segment is used to connect the rotating wheel, and the second branch segment is used to trigger the elastic telescopic rod.

6. A temporary support pier for operation in a special environment according to claim 5, characterized in that: A spring is provided between the base and the outer side of the first branch section. When the elastic buffer device is unloaded, the spring, in conjunction with the rotating component, expands part of the traction rope outward.

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