Multi-point self-balancing walking-type jacking construction method for steel box girders

Abstract

This application relates to the field of bridge construction and provides a multi-point self-balancing walking-type jacking construction method for steel box girders, including the following steps: S1, constructing bridge pier foundations on both sides of the road; S2, erecting temporary supports and jacking platforms on both sides of the road; S3, installing walking-type jacking equipment on the top of the jacking platform, with a pad beam mechanism added to the top of the jacking equipment; S4, installing guide mechanisms on the jacking platform, with positioning components pre-positioning the guide mechanisms located on different jacking platforms; S5, hoisting the steel box girder; S6, assembling the steel box girder into the bridge structure, with the limiting components under the bridge structure slidingly adapted to the guide mechanisms; S7, synchronously jacking the bridge structure at multiple points using various jacking devices; S8, installing the side span box girders; S9, dismantling the temporary supports and jacking platforms. Based on this, it can reduce the outward displacement of the bridge structure during jacking construction, quickly complete the jacking operation of the bridge structure, and accurately position it.

Description

Technical Field

[0001] This application relates to the field of bridge construction, and in particular to a multi-point self-balancing walking-type jacking construction method for steel box girders. Background Technology

[0002] A bridge is a structure built to allow roads to cross natural or man-made obstacles. It is erected above rivers, lakes, seas, roads, or highways, enabling vehicles and pedestrians to pass smoothly. However, constructing a bridge above a road involves assembling and welding steel box girders into a bridge structure, then lifting and moving the structure over the road. This process is difficult and dangerous, and requires improvement.

[0003] A construction method for steel box girders has been disclosed in the relevant technology. The specific construction method is as follows: Step 1, construction preparation; Step 2, construction of the jacking platform and temporary supports; Step 3, installation and commissioning of the walking jacking equipment; Step 4, assembly of steel box girders into the bridge structure; Step 5, assembly of guide beams and back supports; Step 6, jacking of the bridge structure. By jacking the bridge structure simultaneously at multiple points using multiple jacking devices, the requirements for the vertical support force of the temporary supports and the horizontal jacks of the jacking equipment can be reduced, achieving self-balancing of the structure at the jacking support points, thereby reducing the structural stiffness of the temporary supports and the jacking platform, and reducing the input of profiles.

[0004] However, each jacking device is installed on a separate jacking platform, and each jacking device has an installation error. When the installation errors of multiple jacking devices are superimposed, the bridge structure may gradually shift outward during the jacking process. Subsequently, the bridge structure needs to be moved to readjust its installation position to ensure the alignment accuracy of the completed bridge. However, the bridge structure located above the road still presents significant construction difficulties. Therefore, how to reduce the outward shift of the bridge structure during jacking construction has become an urgent problem to be solved. Summary of the Invention

[0005] Based on this, this application provides a multi-point self-balancing walking-type jacking construction method for steel box girders, which can reduce the outward displacement of the bridge structure during jacking construction, and quickly complete the jacking operation and accurate positioning of the bridge structure.

[0006] This application provides a multi-point self-balancing, step-by-step jacking construction method for steel box girders, which adopts the following technical solution:

[0007] A multi-point self-balancing step-by-step jacking construction method for steel box girders includes the following steps:

[0008] Step S1: Construct bridge pier foundations on both sides of the road;

[0009] Step S2: Temporary supports and jacking platforms are erected on both sides of the road;

[0010] Step S3: Install a walking jacking device on the top of the jacking platform, and add a pad beam mechanism on the top of the jacking device. The pad beam mechanism can be offset laterally along the road direction.

[0011] Step S4: Install guide mechanisms on the jacking platform. The guide mechanisms located on different jacking platforms are pre-positioned by positioning components to ensure that the orientation of each group of guide mechanisms is consistent.

[0012] Step S5: Hoist the steel box girder and place it on the jacking platform or temporary support on one side of the road.

[0013] Step S6: The steel box girder is assembled into a bridge structure. The bridge structure has a limiting component underneath, and the limiting component and the guide mechanism are slidably adapted to each other.

[0014] Step S7: Each jacking device simultaneously jacks the bridge structure at multiple points.

[0015] Step S8, installation of the side span box girder;

[0016] Step S9: Dismantle the temporary support and jacking platform.

[0017] By adopting the above-mentioned technical solution, in the bridge construction of this application, after the temporary supports and jacking platforms are erected, guide mechanisms are installed on each jacking platform. The positioning components can be used to keep the orientation of the guide mechanisms consistent and control the installation error of the guide mechanisms within a suitable range. Subsequently, each steel box girder is placed on the jacking platform or temporary supports. After the steel box girders are assembled to form the bridge structure, the sliding fit between the guide mechanism and the limiting component can play a guiding role when the jacking equipment jacks the bridge structure, guiding the movement of the bridge structure. The installation error of the jacking equipment can be eliminated by the lateral offset of the beam support mechanism, thereby reducing the outward offset of the bridge structure during the jacking construction, and quickly completing the jacking operation and accurate positioning of the bridge structure.

[0018] Optionally, the guiding mechanism includes a guide support and a guide slide. The guide support is installed on the jacking platform, and the top surface of the guide support is provided with a guide groove that extends along the extension direction of the guide support and runs through the two opposite sides of the guide support. The guide slide is matched and installed in the guide groove and slides freely inside the guide groove. The top of the guide slide is provided with a locking component that cooperates with the limiting component to limit the movement, so that when the jacking equipment jacks the bridge structure, the guide slide moves with the bridge structure.

[0019] By adopting the above technical solution, after the jacking platform and temporary supports are erected, the guide supports are first fixed to the jacking platform, so that the guide slide is located in the guide groove of the jacking platform. After the steel box girder is hoisted above the jacking platform or temporary supports, the locking assembly at the top of the guide slide is located inside the limiting component at the bottom of the steel box girder. By controlling the movement of the locking assembly to cooperate with the limiting component for limiting, the connection between the guide slide and the limiting component can be quickly completed. When the jacking equipment jacks the bridge structure, the guide slide moves along with the bridge structure. The movement of the guide slide in the guide groove can reduce the possibility of the steel box girder shifting outward, thereby quickly completing the jacking operation of the bridge structure and accurately positioning it.

[0020] Optionally, the limiting component includes two limiting seats spaced apart, each limiting seat having a limiting slot; the locking assembly has two sets, the two sets of locking assemblies respectively cooperating with the two limiting seats for limiting; wherein, the locking assembly includes a movable seat slidably mounted on the guide slide and a driving component for driving the movable seat to move, the movable seat has a locking post on the side away from the adjacent locking assembly, the locking post being inserted and adapted to the limiting slot.

[0021] By adopting the above technical solution, and by setting two sets of snap-fit ​​components, each controlled by a drive component to move the movable seat, the installation error of the guide support relative to the limiting component can be eliminated, ensuring that each set of snap-fit ​​components cooperates with the limiting seat for limiting. By controlling the drive component to drive the movable seat gradually closer to the limiting seat, the snap-fit ​​pins of the movable seat can match and be inserted into the limiting slots of the limiting seat, realizing the connection between the bridge structure and the guide slide, and enabling the guide slide to move together when the bridge structure moves.

[0022] Optionally, guide slides and movable seats are both attached to opposite sides.

[0023] By adopting the above technical solution, the sliding paper located on the side of the guide slide away from the moving seat is used to reduce the frictional resistance between the guide slide and the guide groove, so that the guide slide can slide smoothly in the guide groove when the bridge structure is pushed by the jacking equipment. The sliding paper located on the side of the moving seat away from the guide slide is used to reduce the frictional resistance between the moving seat and the steel box girder. After the bridge structure is pushed and moved directly above the road by the jacking equipment, the control drive component causes the locking post to disengage from the limiting slot, which can easily force the guide slide to disengage from the limiting component, thereby facilitating the recovery and reuse of the guide slide.

[0024] Optionally, the positioning components include a splicing rod assembly and two cross blocks that are slidably inserted at both ends of the splicing rod assembly. The sliding direction of the cross blocks is the same as the extension direction of the splicing rod assembly. Each guide support has a cross groove on its top surface, and the cross blocks are inserted into the cross grooves for adaptation.

[0025] By adopting the above technical solution, after the construction of each jacking platform is completed, the distance between adjacent jacking platforms may fluctuate within the acceptable error range. This application overcomes the positional error between adjacent jacking platforms by sliding two cross blocks to the two ends of the splicing rod group and adjusting the relative position of the cross blocks and the splicing rod group. Then, the cross blocks are aligned and inserted into the cross slots. By observing whether the cross blocks can be matched and inserted into the cross slots, it can be determined whether the adjacent guide supports are aligned. This facilitates the guide slide to leave the original guide slide and enter the next guide slide when the bridge structure is jacked by the jacking equipment, thereby reducing the outward displacement of the steel box girder.

[0026] Optionally, the splicing rod assembly includes multiple sub-rods, each of which is embedded with a first magnetic block and a second magnetic block. The first magnetic block and the second magnetic block are located on two opposite sides of the sub-rod, and the magnetic poles of the first magnetic block and the second magnetic block are opposite. In addition, one of the two adjacent sub-rods has a plug on the side of the sub-rod closest to the other sub-rod, and the other sub-rod has a socket on its side. The plug and the socket are connected and adapted to each other.

[0027] By adopting the above technical solution, the two cross blocks are connected and supported by a splicing rod assembly. When needed, the insertion rods of the sub-rods are inserted into the insertion holes of adjacent sub-rods, and the sub-rods are magnetically connected to each other by the magnetic attraction between the first and second magnetic blocks. This allows for the assembly of a splicing rod assembly with good straightness, facilitating construction personnel to use the positioning component to determine the installation position and accuracy of the guide mechanism. Furthermore, when the positioning component is not in use, separating the individual sub-rods greatly reduces the space occupied by the positioning component, facilitating its transportation and handling.

[0028] Optionally, the splicing rod assembly also includes a rotating drum and a pull rope. The rotating drum is mounted on one of the cross blocks, and one side of the rotating drum is provided with a ratchet and pawl component to limit the rotation of the rotating drum. The pull rope is threaded through each sub-rod, with one end of the pull rope connected to the rotating drum and the other end of the pull rope connected to another cross block.

[0029] By adopting the above technical solution and setting up pull ropes to connect each sub-rod, the possibility of accidental loss of individual sub-rods can be reduced. Furthermore, during high-altitude operations, after the sub-rods are assembled and magnetically connected, a rotating drum is used to wind up the pull ropes, and the pull ropes are kept in a wound state by a ratchet and pawl mechanism. This reduces the possibility of the sub-rods detaching from each other during the operation, thus ensuring the safety of vehicles and pedestrians below during construction.

[0030] Optionally, the side of the sub-member closest to the adjacent sub-member is set as the abutment surface, and the side of the sub-member adjacent to the abutment surface is set as the exposed surface; the sub-member is provided with a through hole for the pull rope to pass through, and the abutment surface is provided with a relief groove connected to the through hole, the relief groove extending through the exposed surface of the sub-member.

[0031] By adopting the above technical solution, the axial length of all sub-rods after assembly may be greater than the distance between the two jacking platforms. This application addresses this by opening clearance grooves on the contact surfaces of the sub-rods. After moving some sub-rods to the outside of the splicing rod group, the two spaced sub-rods can be spliced ​​together by the cooperation of the insert rod and the insertion hole, which can shorten the axial length of the splicing rod group. At this time, the pull rope can enter the clearance groove and play a clearance role, so that each spliced ​​sub-rod can remain in a tight state when the drum winds up the pull rope, ensuring the accuracy of the alignment measurement results of adjacent guide supports.

[0032] Optionally, the beam support mechanism includes a beam support seat and a top cap. The beam support seat is fixed to the top of the jacking device, and the top cap is slidably connected to the top of the beam support seat. The sliding direction of the top cap is perpendicular to the extension direction of the guide groove.

[0033] By adopting the above technical solution, when the jacking equipment operates, it first forces the pad beam seat and the top cap to move upwards. After the top cap abuts against the bridge structure, it pushes the bridge structure up. Then, the jacking equipment can push the pad beam seat, the top cap, and the bridge structure together, thereby delivering the bridge structure above the road. Throughout the movement of the bridge structure, it is guided by the cooperation of the guide slide and the guide groove. Even if there are installation errors in the jacking equipment, the friction force can force the top cap to slide laterally relative to the pad beam seat when the bridge structure is jacked, which has a corrective effect and ensures the accurate positioning of the bridge structure after it is moved above the road.

[0034] Optionally, the top surface of the support beam is provided with a sliding groove, and a T-shaped block is fixed at the bottom of the top cap. The T-shaped block is matched and installed in the sliding groove and slides freely in the sliding groove. Two springs are also provided inside the sliding groove, and the two springs are respectively located on two opposite sides of the T-shaped block.

[0035] By adopting the above technical solution, the two springs can balance the forces on both sides of the T-block. When the jacking device pushes the bridge structure a certain distance and resets it, the elastic force between the two springs can automatically reset the T-block and the top cap to the center position of the sliding groove, so that the bridge structure can drive the top cap to shift laterally to avoid collision during the next jacking.

[0036] In summary, this application includes at least one of the following beneficial technical effects:

[0037] 1. After the various steel box girders are assembled to form the bridge structure, the movement of the bridge structure can be guided by the sliding fit between the guide mechanism and the limiting component; the installation error of the jacking equipment can be eliminated by the lateral offset of the pad beam mechanism, thereby reducing the outward offset of the bridge structure during the jacking construction, and quickly completing the jacking operation and accurate positioning of the bridge structure.

[0038] 2. By setting two sets of snap-fit ​​components, each controlled by a drive component to move the movable seat, the installation error of the guide support relative to the limiting component can be eliminated, ensuring that each set of snap-fit ​​components cooperates with the limiting seat for limiting, and facilitating the connection between the bridge structure and the guide slide, so that the bridge structure can move the guide slide together when it moves.

[0039] 3. By adjusting the relative positions of the cross blocks and splicing rods, the positional error between adjacent jacking platforms can be overcome. The cross blocks are aligned and inserted into the cross slots. Observing whether the cross blocks can be matched and inserted into the cross slots can determine whether the adjacent guide supports are aligned. In this way, when the bridge structure is subsequently jacked, the guide slide can leave the original guide slide and enter the next guide slide, which can reduce the outward displacement of the steel box girder. Attached Figure Description

[0040] Figure 1 This is a schematic diagram of the bridge structure before it is jacked up in this embodiment;

[0041] Figure 2 This is a schematic diagram of the bridge structure after jacking and the side span box girder after installation in this embodiment;

[0042] Figure 3 This is a schematic diagram of the jacking platform in this embodiment;

[0043] Figure 4 This is a structural diagram of the top of the beam support in this embodiment, mainly showing the connection relationship between the top cap and the beam support;

[0044] Figure 5 This is a schematic diagram of the guide mechanism in this embodiment;

[0045] Figure 6 This is a structural diagram of the jacking device lifting the steel box girder in this embodiment, mainly showing the cooperation relationship between the guide slide and the guide support;

[0046] Figure 7 This is a schematic diagram of the positioning component in this embodiment;

[0047] Figure 8 This is a partial sectional view of the positioning component in this embodiment, which mainly shows the cooperation relationship between adjacent sub-members;

[0048] Figure 9 This is a schematic diagram of the sub-rod structure in this embodiment;

[0049] Figure 10 This is a half-sectional view of the sub-member in this embodiment, mainly showing the mating relationship between the cross block and the sub-member;

[0050] Figure 11 yes Figure 7 Enlarged view of point A in the middle.

[0051] Explanation of reference numerals in the attached drawings: 1. Pier foundation; 2. Temporary support pier; 3. Jacking platform; 31. Jacking equipment; 4. Steel box girder; 41. Limiting seat; 411. Limiting slot; 412. Extension; 5. Side span box girder; 6. Guide beam; 7. Support beam mechanism; 71. Support beam seat; 711. Sliding groove; 72. Top cap; 721. T-block; 73. Spring; 8. Guide mechanism; 81. Guide support; 811. Guide slide; 812. Cross groove; 82. Guide slide; 821. Sliding groove; 83. Snap-fit ​​assembly; 84. Moving seat; 841. Snap-fit ​​column; 85. Drive component;

[0052] 9. Positioning component; 91. Cross block; 911. Movable insert block; 92. Sub-rod; 921. First magnetic block; 922. Second magnetic block; 923. Insert rod; 924. Insertion hole; 925. Through hole; 926. Clearance groove; 927. Abutment surface; 928. Exposed surface; 929. Movable groove; 9291. Through area; 9292. Movable area; 93. Rotary drum; 931. Handle component; 932. Ratchet and pawl component; 94. Pull rope. Detailed Implementation

[0053] The following is in conjunction with the appendix Figure 1-11 This application will be described in further detail.

[0054] This application discloses a multi-point self-balancing walking-type jacking construction method for steel box girders, which is mainly used for the construction and building of bridges that cross directly above roads.

[0055] Reference Figure 1 , Figure 2 The multi-point self-balancing step-by-step jacking construction method for steel box girders involves construction structures including pier foundation 1, temporary support 2, jacking platform 3, steel box girder 4, side span box girder 5, and guide beam 6. Pier foundation 1, temporary support 2, and jacking platform 3 are all provided in multiple sets and are located on both sides of the road to support the erection of steel box girder 4 and side span box girder 5.

[0056] Reference Figure 3The jacking platform 3 is equipped with a walking jacking device 31 on its top. There are at least two sets of jacking devices 31, each set evenly distributed on the top surface of the jacking platform 3, which can maintain the force balance of the steel box girder 4 when supporting it. Each jacking device 31 includes a horizontal jack fixed to the jacking platform 3 and a lifting jack connected to the movable end of the horizontal jack. A beam support mechanism 7 is fixed to the movable end of the lifting jack for supporting the steel box girder 4. The beam support mechanism 7 includes a beam support seat 71 and a top cap 72. The beam support seat 71 is fixed to the movable end of the lifting jack and located on the top of the jacking platform 3. The top cap 72 is slidably connected to the top of the beam support seat 71, and the sliding direction of the top cap 72 is the same as the road direction, allowing the top cap 72 to be laterally offset along the road direction.

[0057] Specifically, refer to Figure 4 The top surface of the pad beam seat 71 is provided with a sliding groove 711. The extension direction of the sliding groove 711 is set in the same direction as the road direction, and the cross-sectional shape of the sliding groove 711 is T-shaped. In addition, there are multiple sliding grooves 711, and all sliding grooves 711 are equidistant from each other in the pushing direction of the horizontal jack.

[0058] The top cap 72 has a T-shaped block 721 fixed to its bottom. The number of T-shaped blocks 721 is equal to the number of sliding grooves 711. Each T-shaped block 721 is installed in its corresponding sliding groove 711 and can move freely within the sliding groove 711. In addition, two springs 73 are provided inside the sliding groove 711. The two springs 73 are located on opposite sides of the T-shaped block 721. One end of the spring 73 is welded and fixed to the inner wall of the sliding groove 711, and the other end of the spring 73 is welded and fixed to the T-shaped block 721. The two springs 73 exert equal forces on both sides of the T-shaped block 721, which can restrict the free movement of the top cap 72 and make the top cap 72 stably stay in the center position of the sliding groove 711.

[0059] Back Figure 3 The jacking platform 3 is also equipped with a guide mechanism 8. Each jacking platform 3 has two sets of guide mechanisms 8, located on opposite sides of each jacking device 31. The guide mechanism 8 includes a guide support 81 and a guide slide 82. The guide support 81 is fixed to the jacking platform 3 with bolts. (See also...) Figure 5 The top surface of the guide support 81 is provided with a guide groove 811, the extension direction of the guide groove 811 is perpendicular to the road direction, and the guide support 81 extends along the two opposite sides of the guide support 81. The guide slide 82 is installed inside the guide groove 811 and can slide freely along the guide groove 811; in addition, the top of the guide slide 82 is provided with a snap-fit ​​assembly 83, and the number of snap-fit ​​assemblies 83 on the top of one guide slide 82 is set to two sets.

[0060] Reference Figure 6 The bottom of the steel box girder 4 is provided with two limiting components, which respectively cooperate with two guide slides 82. The limiting components include two limiting seats 41 fixed to the steel box girder 4, spaced apart from each other. Each limiting seat 41 has an integrally formed extension 412 on its side away from the steel box girder 4, extending to the side of the limiting seat 41 near the adjacent limiting seat 41. Each limiting seat 41 has a limiting slot 411 on its side facing the adjacent limiting seat 41. Two sets of locking components 83 can cooperate with the limiting slots 411 of the two limiting seats 41 to limit movement, so that after the steel box girder 4 is placed on the jacking platform 3 and assembled into the bridge structure, the guide slides 82 can move along with the bridge structure.

[0061] Back Figure 5 The snap-fit ​​assembly 83 includes a movable base 84 and a drive component 85. A sliding groove 821 is provided on the top of the guide slide 82, and the movable base 84 is slidably installed inside the sliding groove 821. An integrally formed snap-fit ​​post 841 is provided on the side of the movable base 84 away from the adjacent snap-fit ​​assembly 83, and the snap-fit ​​post 841 can be inserted and engaged with the limiting snap-fit ​​groove 411. The drive component 85 is a micro servo motor. The cylinder of the drive component 85 is fixed to the guide slide 82 and located between two adjacent movable bases 84 of the two sets of snap-fit ​​assemblies 83. The output end of the drive component 85 is connected to the movable base 84 to drive the movable base 84 to move.

[0062] Simultaneously refer to Figure 6 When the steel box girder 4 is placed on the jacking platform 3, the two movable seats 84 are located between the two limiting seats 41. At this time, the control drive component 85 is activated, which can make the movable seat 84 move towards the adjacent limiting seat 41, thereby making the locking column 841 of the movable seat 84 match the limiting slot 411 of the limiting seat 41. Thus, when the jacking device 31 jacks the steel box girder 4, the guide slide 82 moves together with the bridge structure.

[0063] In addition, sliding paper (not shown in the figure) is attached to the opposite sides of the guide slide 82 and the movable seat 84. The sliding paper on the side of the guide slide 82 away from the movable seat 84 is used to reduce the frictional resistance between the guide slide 82 and the guide groove 811, so that the guide slide 82 can slide smoothly in the guide groove 811 when the bridge structure is pushed by the jacking device 31. The sliding paper on the side of the movable seat 84 away from the guide slide 82 is used to reduce the frictional resistance between the movable seat 84 and the steel box girder 4. After the bridge structure is pushed and moved to directly above the road by the jacking device 31, the control drive component 85 causes the locking post 841 to disengage from the limiting slot 411, and the two movable seats 84 are still located between the two extensions 412. This can easily force the guide slide 82 to disengage from the limiting component, and thus easily recycle and reuse the guide slide 82.

[0064] Reference Figure 7 After each set of guide mechanisms 8 is fixed to its respective jacking platform 3, a positioning component 9 is needed to pre-position the guide supports 81 to ensure that each set of guide mechanisms 8 faces the same direction. The positioning component 9 includes a splicing rod assembly and two cross blocks 91. The splicing rod assembly includes multiple sub-rods 92 spliced ​​sequentially; (Note: The last sentence appears to be incomplete and possibly refers to a different context.) Figure 8 Each sub-rod 92 is embedded with a first magnetic block 921 and a second magnetic block 922. The first magnetic block 921 and the second magnetic block 922 are located on two opposite sides of the sub-rod 92, so that the sides of adjacent sub-rods 92 can magnetically attract each other when they are in contact.

[0065] In addition, one of the two adjacent sub-rods 92 has a plug 923 on its side near the other sub-rod 92, and the plug 923 is integrally formed with the sub-rod 92; the other sub-rod 92 has a socket 924 on its side, and the plug 923 is inserted into the socket 924. By inserting the plug 923 of the sub-rod 92 into the socket 924 of the other sub-rod 92, and by the magnetic attraction between the first magnetic block 921 and the second magnetic block 922, the stability of the spliced ​​rod assembly can be improved.

[0066] Reference Figure 9 In this embodiment, the side of the sub-member 92 closest to the adjacent sub-member 92 is designated as the abutment surface 927, and the side of the sub-member 92 adjacent to the abutment surface 927 is designated as the exposed surface 928; refer to Figure 10 Each of the two sub-members 92 located at both ends of the splicing rod assembly is provided with a movable groove 929. The movable groove 929 is located on the side of the sub-member 92 away from the abutment surface 927. The movable groove 929 includes a through-hole area 9291 and a movable area 9292 connected to it. The movable area 9292 is located on the side of the through-hole area 9291 closer to the abutment side. The cross-sectional shape of the movable area 9292 and the through-hole area are both rectangular, and the inner diameter of the movable area 9292 is larger than the inner diameter of the through-hole area 9291.

[0067] The cross block 91 is cross-shaped, and a movable insert 911 is integrally formed at the end of the cross block 91. The cross block 91 is partially inserted into the through area 9291, and the movable insert 911 is matched and installed inside the movable area 9292. Through the free movement of the movable insertion hole 924 inside the movable area 9292, the cross block 91 and the splicing rod assembly can be slidably engaged. Moreover, the sliding direction of the cross block 91 is the same as the extension direction of the splicing rod assembly, so as to adjust the overall length of the positioning component 9.

[0068] Back Figure 5Each guide support 81 has a cross groove 812 on its top surface. The cross groove 812 is located on one side of the extension direction of the guide support 81, and the cross block 91 can be inserted into the cross groove 812. During installation, by observing that the cross block 91 can be inserted into the cross groove 812, it can be determined whether the adjacent guide supports 81 are aligned. This allows the bridge structure to move the guide slide 82 and smoothly enter the next guide slide 811 after leaving its current guide slide 811, thus reducing the outward displacement of the steel box girder 4.

[0069] See also Figure 11 The splicing rod assembly also includes a rotating drum 93 and a pull rope 94. One of the cross blocks 91 is fixed with a mounting bracket, and the rotating drum 93 is rotatably mounted on the mounting bracket. A handle component 931 is fixed to one side of the rotating drum 93, and the rotating drum 93 can be driven to rotate by operating the handle component 931. A ratchet and pawl component 932 is provided on one side of the rotating drum 93. The ratchet and pawl component 932 includes a ratchet fixed to the rotating drum 93, a pawl rotatably connected to the mounting bracket, and a torsion spring for driving the pawl to engage with the ratchet. The ratchet and pawl can rotate in one direction and restrict the rotating drum 93 from rotating in the opposite direction. The specific structure of the ratchet and pawl component 932 is prior art and will not be described in detail here.

[0070] Simultaneously refer to Figure 9 Each sub-rod 92 has a through hole 925 on its contact surface 927. The through hole 925 extends along the extension direction of the sub-rod 92 and passes through the two opposite sides of the sub-rod 92. The pull rope 94 is threaded through the through hole 925 of each sub-rod 92. One end of the pull rope 94 is connected to the rotating drum 93, and the other end of the pull rope 94 is connected to another cross block 91. In actual use, after each sub-rod 92 is sequentially inserted and magnetically connected to each other, the handle component 931 is operated to drive the rotating drum 93 to rotate, which can tighten the pull rope 94, keep each sub-rod 92 in a tight connection state, reduce the possibility of the sub-rods 92 separating from each other during operation, and ensure the safety of vehicles and pedestrians below during construction operations.

[0071] Additionally, refer to Figure 9 Each sub-rod 92 has a relief groove 926 on its contact surface 927. The relief groove 926 is connected to the through hole 925 and extends through the exposed surface 928 of the sub-rod 92. When the axial length of all sub-rods 92 after assembly is greater than the distance between the two jacking platforms 3, the axial length of the splicing rod group can be shortened by moving some sub-rods 92 to the outside of the splicing rod group and then splicing the spaced sub-rods 92 together through the cooperation of the insertion rod 923 and the insertion hole 924. At this time, the pull rope 94 can enter the relief groove 926 and play a relief role so that each spliced ​​sub-rod 92 can be kept in a tight state, ensuring the accuracy of the alignment measurement results of the adjacent guide support 81.

[0072] This embodiment describes a multi-point self-balancing step-by-step jacking construction method for steel box girders, which specifically includes the following steps:

[0073] Step S1: Construction of bridge pier foundations 1 on both sides of the road.

[0074] Step S2: Temporary supports 2 and jacking platforms 3 are erected on both sides of the road.

[0075] Step S3: A jacking device 31 is installed on the top of the jacking platform 3. A pad beam mechanism 7 is added to the top of the jacking device 31. The pad beam seat 71 of the pad beam mechanism 7 is fixed to the movable end of the lifting jack of the jacking device 31. The top cap 72 is slidably installed on the top surface of the pad beam seat 71, and the top cap 72 can be laterally offset along the road direction.

[0076] Step S4: The jacking platform 3 is equipped with guide mechanisms 8. The guide mechanisms 8, which are located on different jacking platforms 3, are pre-positioned by positioning components 9 to ensure that the orientation of each group of guide mechanisms 8 is consistent.

[0077] Step S4 specifically includes:

[0078] S41, the guide support 81 is fixed to the jacking platform 3 by bolts.

[0079] S42, each sub-rod 92 is sequentially inserted and assembled to form a splicing rod group, so that the axial length of the splicing rod group is close to the length of the two adjacent guide supports 81 to be measured; the operating handle part 931 rotates the rotating drum 93 and winds up the pull rope 94 to keep the splicing rod group stable.

[0080] S43, fine-tune the relative position between the cross block 91 and the splicing rod assembly, align the two cross blocks 91 with the cross grooves 812 of the two adjacent guide supports 81 respectively, and determine whether the two cross blocks 91 can accurately enter the two cross grooves 812; if the two cross blocks 91 cannot accurately enter the two cross grooves 812, the guide supports 81 need to be readjusted and fixed.

[0081] S44, each guide slide 82 is suspended and placed inside each guide slide 811, controlling the action of each drive component 85, so that the moving seats 84 of each pair of adjacent snap-fit ​​components 83 move closer to each other.

[0082] Step S5: Hoist the steel box girder 4 and place it on the jacking platform 3 or temporary support 2 on one side of the road.

[0083] In step S6, the steel box girders 4 are assembled and welded in sequence to form a bridge structure. The bridge structure has a limiting component at the bottom. The two limiting seats 41 of the limiting component are located on opposite sides of the two sets of snap-fit ​​components 83. The driving components 85 are controlled to move to force the two moving seats 84 to move away from each other. The limiting post of the moving seat 84 can be inserted and engaged with the limiting slot 411 of the limiting seat 41, so that the guide slide 82 can move together with the bridge structure.

[0084] In step S7, each of the jacking devices 31 simultaneously jacks the bridge structure at multiple points. Before jacking, guide beams 6 need to be installed at the front end of the bridge structure.

[0085] Step S8: Install the side span box girder 5; push the bridge structure directly above the road and span across two adjacent jacking platforms 3; remove the road and hoist and install the side span box girders 5 on both sides of the bridge structure, with the installation sequence proceeding from the outside towards the direction gradually closer to the bridge structure; weld and fix the bridge structure to each side span box girder 5.

[0086] Step S9: Dismantle the temporary support 2 and the jacking platform 3; before dismantling, perform linear measurements on the entire bridge and dismantle it only after it meets the design requirements; dismantle it in a specific order so that the weight of the steel box girder 4 finally falls on the bridge pier foundation 1.

[0087] The implementation principle of the multi-point self-balancing walking-type jacking construction method for steel box girders in this application embodiment is as follows:

[0088] When the bridge structure is installed using this construction method, the bridge structure is pushed by the jacking device 31. Through the guiding cooperation between the guide slide 82 and the guide slide 811, the bridge structure can be guided to move in the set direction. The installation error of the jacking device 31 can be eliminated by the lateral offset of the pad beam mechanism 7. This reduces the outward offset of the bridge structure during the jacking construction, and allows for the rapid completion of the jacking operation and accurate positioning of the bridge structure.

[0089] The above are preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made to the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A multi-point self-balancing step-by-step jacking construction method for steel box girders, characterized in that, Includes the following steps: Step S1: Construct bridge pier foundations (1) on both sides of the road; Step S2: Construct temporary supports (2) and jacking platforms (3) on both sides of the road; Step S3: Install walking jacking equipment (31) on the top of the jacking platform (3), and add a pad beam mechanism (7) on the top of the jacking equipment (31). The pad beam mechanism (7) can be offset laterally along the road direction; Step S4: Install guide mechanisms (8) on the jacking platform (3). The guide mechanisms (8) set on different jacking platforms (3) are pre-positioned by positioning components (9) to ensure that the orientation of each group of guide mechanisms (8) is consistent; Step S5: Hoist the steel box girder (4) and place it on the jacking platform (3) or temporary supports (2) on one side of the road; Step S6: Assemble the steel box girder (4) to form a bridge structure. The bridge structure has a limiting component below it. The limiting component and the guide mechanism (8) slide and adapt to each other; Step S7: Each jacking device (31) jacks the bridge structure at multiple points simultaneously; Step S8, install the side span box girder (5); Step S9, dismantle the temporary support (2) and the jacking platform (3); The guiding mechanism (8) includes a guide support (81) and a guide slide (82). The guide support (81) is installed on the jacking platform (3). The top surface of the guide support (81) is provided with a guide groove (811). The guide groove (811) extends along the extension direction of the guide support (81) and passes through the two opposite sides of the guide support (81). The guide slide (82) is matched and installed in the guide groove (811) and slides freely inside the guide groove (811). The top of the guide slide (82) is provided with a snap-fit ​​assembly (83) that cooperates with the limiting component to limit the movement, so that when the jacking device (31) jacks the bridge structure, the guide slide (82) moves together with the bridge structure. The limiting component includes two limiting seats (41) spaced apart, each of the limiting seats (41) having a limiting slot (411); the snap-fit ​​assembly (83) has two sets, the two sets of snap-fit ​​assemblies (83) respectively cooperate with the two limiting seats (41) for limiting; wherein, the snap-fit ​​assembly (83) includes a movable seat (84) slidably mounted on the guide slide (82) and a driving component (85) for driving the movable seat (84) to move, the movable seat (84) has a snap-fit ​​post (841) on the side away from the adjacent snap-fit ​​assembly (83), the snap-fit ​​post (841) is inserted and adapted to the limiting slot (411); The positioning component (9) includes a splicing rod assembly and two cross blocks (91) that are slidably inserted at both ends of the splicing rod assembly. The sliding direction of the cross blocks (91) is the same as the extension direction of the splicing rod assembly. Each guide support (81) has a cross groove (812) on its top surface. The cross blocks (91) and the cross grooves (812) are inserted and adapted to each other. The splicing rod assembly includes multiple sub-rods (92), wherein each sub-rod (92) is embedded with a first magnetic block (921) and a second magnetic block (922). The first magnetic block (921) and the second magnetic block (922) are respectively located on two opposite sides of the sub-rod (92), and the magnetic poles of the first magnetic block (921) and the second magnetic block (922) are opposite. In addition, one of the two adjacent sub-rods (92) has a plug rod (923) on its side near the other sub-rod (92), and the other sub-rod (92) has a socket (924) on its side. The plug rod (923) and the socket (924) are plugged into each other. The beam support mechanism (7) includes a beam support seat (71) and a top cap (72). The beam support seat (71) is fixed to the top of the jacking device (31), and the top cap (72) is slidably connected to the top of the beam support seat (71). The sliding direction of the top cap (72) is perpendicular to the extension direction of the guide groove (811).

2. The multi-point self-balancing step-by-step jacking construction method for steel box girders according to claim 1, characterized in that: The guide slide (82) and the movable seat (84) are both attached with sliding paper on opposite sides.

3. The multi-point self-balancing step-by-step jacking construction method for steel box girders according to claim 1, characterized in that: The splicing rod assembly also includes a rotating drum (93) and a pull rope (94). The rotating drum (93) is rotatably mounted on one of the cross blocks (91), and one side of the rotating drum (93) is provided with a ratchet and pawl member (932) for limiting the rotation of the rotating drum (93). The pull rope (94) is threaded through each sub-rod (92), one end of the pull rope (94) is connected to the rotating drum (93), and the other end of the pull rope (94) is connected to another cross block (91).

4. The multi-point self-balancing step-by-step jacking construction method for steel box girders according to claim 3, characterized in that: The side of the sub-rod (92) near the adjacent sub-rod (92) is provided as an abutment surface (927), and the side of the sub-rod (92) adjacent to the abutment surface (927) is provided as an exposed surface (928); the sub-rod (92) is provided with a through hole (925) for the pull rope (94) to pass through, and the abutment surface (927) is provided with a relief groove (926) connected to the through hole (925), and the relief groove (926) extends through the exposed surface (928) of the sub-rod (92).

5. The multi-point self-balancing step-by-step jacking construction method for steel box girders according to claim 1, characterized in that: The top surface of the pad beam seat (71) is provided with a sliding groove (711), and the bottom of the top cap (72) is fixed with a T-shaped block (721). The T-shaped block (721) is matched and installed in the sliding groove (711) and slides freely in the sliding groove (711). The sliding groove (711) is also provided with two springs (73), and the two springs (73) are respectively located on two opposite sides of the T-shaped block (721).

Images