Steel bridge jacking point limited space 400t jacking device

Abstract

The utility model relates to a steel bridge jacking point limited space 400t jacking device suitable for railway, highway and municipal bridge engineering, in particular to a high-tonnage jacking device suitable for meeting the requirement for high-tonnage jacking in a limited space. The device comprises a variable-height steel distribution beam, a jack system, a supporting base plate and a supporting base, and the variable-height steel distribution beam is formed by welding Q345 steel plates and is of an arch structure so as to optimize stress and reduce damage to a non-jacking area. The stress area of the top of the device is controlled within the range of 300 mm * 300 mm, distribution of jacking force is optimized through the distribution beams, a plurality of small-tonnage jacks act in a combined mode to replace a single large-tonnage jack, and the requirement for the installation space is lowered. The device adopts the supporting base plate to adapt to displacement change caused by temperature difference, and the jacking safety is improved. The device is simple in structure, convenient to construct, low in cost and suitable for support replacement projects of different steel bridge structures.

Description

Technical Field

[0001] This utility model relates to a structural form of lifting steel bridges used in railway, highway, and municipal bridge engineering to withstand vertical jacking forces. Background Technology

[0002] Bridge bearings come in numerous types and installation methods, bearing significant concentrated forces and forming a crucial link in bridge structural construction, as well as a point prone to construction errors. Similarly, the replacement and repair processes for bearings are diverse, requiring different construction techniques and technical measures depending on the bridge structure, bearing type, construction environment, and other technical requirements. Steel bridges are heavy, and seismic blocks are located near the bearings. Lifting points can only be set near the bearings and seismic blocks, specifically at the intersection of the transverse diaphragm and longitudinal stiffening plate of the steel box girder. The lifting area of ​​the box girder bottom plate is limited to a 300 mm × 300 mm plane centered on this intersection. However, a single lifting point carries a large load, and the bottom of the girder does not have sufficient space for a single large-tonnage jack. Therefore, how to safely and reliably replace bearings without affecting the normal passage of the steel bridge is a problem that needs to be studied. Utility Model Content

[0003] The technical problem this invention aims to solve is: to design a device whose top is located at the intersection of the transverse diaphragm and longitudinal stiffening plate of the steel box girder, with a force-bearing area within a 300 mm × 300 mm plane centered on the intersection point. The bottom of the device expands the force-bearing area, allowing several jacks to act simultaneously on its bottom. Simultaneously, the device should be simple to assemble and weld, and lightweight. Furthermore, when replacing the supports, the underlying support pads need to be repaired. After the jacks are lifted, a period of time is required before they can be removed. During this process, the steel bridge expands and contracts due to temperature changes, causing a horizontal force from the steel bridge base plate to act on the top of the lifting device. This horizontal force needs to be eliminated during construction.

[0004] The technical solution adopted by this utility model to solve the above-mentioned technical problems is as follows: a variable-height steel distribution beam is added at the intersection of the transverse diaphragm and the longitudinal stiffening plate on the bottom surface of the beam. This satisfies both the force-bearing area requirement of the jacking point and the need to arrange multiple small-tonnage jacks. A 200t jack is installed in the middle of the variable-height jacking steel distribution beam, and a 100t jack is arranged at each end, with a total of three jacks combined for jacking at one jacking point. In addition, 300mm×300mm×10mm thick steel plates and 5mm thick rubber plates are added at the jacking point positions of the distribution beam and the bottom of the steel box girder to accommodate the longitudinal and transverse displacement of the steel box girder under temperature difference effects. The variable-height steel distribution beam is welded from Q345 grade steel plates, forming an arched structure to prevent its ends from deflecting upwards and contacting the non-jacking point areas of the bottom plate of the steel box girder during jacking, thus avoiding secondary damage. Therefore, in addition to meeting the strength requirements, the control of deflection deformation is also particularly important for the distribution beam.

[0005] This utility model includes a variable-height steel distribution beam, installed at the intersection of the transverse diaphragm and longitudinal stiffening plate on the bottom surface of the steel box girder, and welded from Q345 grade steel plate to form an arch structure; a jack system, including one 200t jack and two 100t jacks, with the 200t jack located in the middle of the variable-height steel distribution beam and the 100t jacks respectively arranged at both ends of the variable-height steel distribution beam; a support plate, including a 300mm×300mm×10mm thick steel plate and a 300mm×300mm×5mm thick rubber plate, the support plate is set at the contact position between the variable-height steel distribution beam and the bottom of the steel box girder to accommodate the longitudinal and transverse displacement of the steel box girder under the effect of temperature difference; and a support base, located below the jacks and in contact with the top of the concrete pier to provide stable support.

[0006] Compared with the prior art, the advantages of this utility model are: the device has a simple structure, is easy to construct, saves labor and materials, saves project costs, and reduces construction costs. Attached Figure Description

[0007] Figure 1 Elevation view of the 400t lifting device for the steel bridge jacking point in a confined space, arranged along the bridge direction.

[0008] Figure 2 End view of the variable height steel distribution beam of this utility model.

[0009] Figure 3 Side view of the variable height steel distribution beam of this utility model.

[0010] Figure 4 Plan view of the variable height steel distribution beam of this utility model. Detailed Implementation

[0011] The present invention will be further described in detail below with reference to the drawings.

[0012] Figure 1This is an elevation view of the 400t jacking device for the steel bridge jacking point in the confined space of this utility model, arranged along the bridge direction. A variable-height steel distribution beam (1) is added at the intersection of the transverse diaphragm (5) and the longitudinal stiffening plate on the bottom surface of the beam, which satisfies the force-bearing area requirement of the jacking point and also meets the requirement of arranging multiple small-tonnage jacks (7, 8). A 200t jack (8) is set in the middle of the variable-height jacking steel distribution beam (1), and a 100t jack (7) is arranged at each end. A total of 3 jacks (7, 8) are combined for jacking at one jacking point. In addition, a 300 mm × 300 mm × 10 mm thick steel plate (2) and a 300 mm × 300 mm × 5 mm thick rubber plate (3) are added at the jacking point position between the variable-height jacking steel distribution beam (1) and the bottom (4) of the steel box girder to accommodate the longitudinal and transverse displacement of the steel box girder under the effect of temperature difference. The variable-height jacking steel distribution beam (1) is welded from Q345 grade steel plates to form an arched structure with a width of 300mm, a length of 900mm, and a height that varies from 120mm to 150mm. This prevents secondary damage caused by the upward deflection of the two ends of the distribution beam (1) contacting the non-jacking point area of ​​the bottom plate (4) of the steel box girder during jacking. Therefore, in addition to meeting the strength requirements, the control of deflection deformation is also very important for the distribution beam (1). Small-tonnage jacks (7, 8) are placed directly on the top of the concrete pier (6).

[0013] Figure 2 This is a view of the end face of the variable height steel distribution beam of this utility model. The variable height lifting steel distribution beam is welded from Q345 grade steel plate to form an arch structure, which avoids secondary damage caused by its two ends deflecting upwards and contacting the non-lifting point area of ​​the bottom plate of the steel box girder during the lifting. Therefore, in addition to meeting the strength requirements, the control of deflection deformation is also very important for the distribution beam. The distribution beam is 300mm wide, 900mm long, and the height varies from 120mm to 150mm. The top plate (1) of the distribution beam is made of 10mm thick steel plate and processed into an arch structure. The bottom plate (2) is made of 300mm×900mm×10mm thick steel plate. The stiffening plate (3) is made of variable height steel plate with a height ranging from 100mm to 130mm, a length of 900mm, and a thickness of 10mm. There are 3 stiffening plates (3) in total, with the middle one arranged in the center and the outer stiffening plate (3) 50mm away from the edge of the bottom plate (2). The top plate, bottom plate, and stiffening plate are welded together.

[0014] Figure 3This is a side view of the variable-height steel distribution beam of this utility model. The variable-height lifting steel distribution beam is welded from Q345 grade steel plates to form an arched structure, which avoids secondary damage caused by its two ends deflecting upwards and contacting the non-lifting point area of ​​the bottom plate of the steel box girder during the lifting process. Therefore, in addition to meeting the strength requirements, the control of deflection deformation is also very important for the distribution beam. The distribution beam is 300mm wide, 900mm long, and its height varies from 120mm to 150mm. The top plate (1) of the distribution beam is made of 10mm thick steel plate and processed into an arched structure. The bottom plate (2) is made of 300mm×900mm×10mm thick steel plate. The stiffening plate (3) is made of variable-height steel plate with a height ranging from 100mm to 130mm, a length of 900mm, and a thickness of 10mm. There are 3 stiffening plates (3) in total, with the middle one arranged in the center and the outer stiffening plate (3) 50mm away from the edge of the bottom plate (2). The top plate, bottom plate, and stiffening plate are welded together.

[0015] Figure 4 This is a plan view of the variable-height steel distribution beam of this utility model. The variable-height jacking steel distribution beam is welded from Q345 grade steel plates to form an arched structure, which avoids secondary damage caused by its two ends deflecting upwards and contacting the non-jacking point area of ​​the bottom plate of the steel box girder during jacking. Therefore, in addition to meeting the strength requirements, the control of deflection deformation is also very important for the distribution beam. The distribution beam is 300mm wide, 900mm long, and its height varies from 120mm to 150mm. The top plate (1) of the distribution beam is made of 10mm thick steel plate and processed into an arched structure. The bottom plate (2) is made of 300mm×900mm×10mm thick steel plate. The stiffening plate (3) is made of variable-height steel plate with a height ranging from 100mm to 130mm, a length of 900mm, and a thickness of 10mm. There are 3 stiffening plates (3) in total, with the middle one arranged in the center and the outer stiffening plate (3) 50mm away from the edge of the bottom plate (2). The top plate, bottom plate, and stiffening plate are welded together.

Claims

1. A steel bridge jacking point limited space 400t jacking device, comprising: a variable height steel distribution beam installed at the intersection of the transverse bulkhead and the longitudinal stiffener plate of the steel box girder bottom and welded from Q345 grade steel plates to form an arch structure; a jack system including one 200t jack and two 100t jacks, the 200t jack being located in the middle of the variable height steel distribution beam and the 100t jacks being arranged at both ends of the variable height steel distribution beam; a support pad plate including a 300mm×300mm×10mm thick steel plate and a 300mm×300mm×5mm thick rubber plate, the support pad plate being arranged at the contact position of the variable height steel distribution beam and the steel box girder bottom to adapt to the longitudinal and lateral displacement of the steel box girder under the temperature difference effect; a support base located below the jack and in contact with the top of the concrete pier to provide stable support.

2. The steel bridge jacking point limited space 400t jacking device according to claim 1, characterized in that: The variable height steel distribution beam has a height range of 120mm to 150mm, a width of 300mm, and a length of 900mm in the length direction.

3. The steel bridge jacking point limited space 400t jacking device according to claim 1, characterized in that: The variable height steel distribution beam is provided with stiffeners with a height difference of 100mm to 130mm, a length of 900mm, and a thickness of 10mm, with the middle stiffener being arranged in the middle and the outer stiffeners being 50mm away from the edge of the bottom plate.

4. The steel bridge jacking point limited space 400t jacking device according to claim 1, characterized in that: The top plate of the variable height steel distribution beam is made of a 10mm thick steel plate, the bottom plate is made of a 300mm×900mm×10mm thick steel plate, and the stiffener is made of a variable height steel plate with a height difference and is fixedly connected by welding.

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