Auxiliary device and method for incremental launching construction of through steel truss arch bridge

Abstract

The application discloses a kind of auxiliary devices and methods for incremental launching construction of through steel truss arch bridge, and the auxiliary device includes two steel cushion beams between the walking jack on the top of two rows of multiple temporary piers and the two steel longitudinal beams with inverted V-shaped longitudinal slope with high middle and low ends in length direction, the top plane of each steel cushion beam is parallel to the bottom plane, multiple groups of steel cushion block assemblies are fixed on the top plane of each steel cushion beam, the top surface of each steel cushion block is consistent with the slope of the bottom inclined surface of each steel longitudinal beam at its length position and mutually adheres;The length of each steel cushion beam is shorter than the length of each steel longitudinal beam, and the steel guide beam at both ends of each steel cushion beam is an integral whole, and the steel guide beam at both ends of each steel cushion beam is cut off after the incremental launching of through steel truss arch bridge. The incremental launching construction process using the auxiliary device will not damage the main steel beam of the bridge, only normal reinforcement structure and support structure are needed for the connection of steel guide beam, and steel material is relatively saved.

Description

Technical Field

[0001] This invention relates to the field of construction technology for under-deck steel truss arch bridges, specifically to an auxiliary device and method for the jacking construction of under-deck steel truss arch bridges. Background Technology

[0002] The jacking construction of a through-type steel truss arch bridge is a common existing technology. Generally, permanent piers and multiple temporary piers are constructed first, and the through-type steel truss arch bridge is assembled on the shore. Then, using sliding tracks and jacking equipment such as walking jacks mounted on top of each temporary pier, the assembled through-type steel truss arch bridge is jacked onto the predetermined permanent pier and positioned. The equipment and temporary piers are then dismantled. It's easy to understand that the two longitudinal steel beams in the bridge deck rest at the same position along their length on two piers symmetrically arranged along the width of the bridge.

[0003] For the jacking construction of a lower-bearing steel truss arch bridge where the bottom surfaces of the two longitudinal steel beams of the bridge deck are on the same horizontal plane along the length direction, the conventional jacking construction method can be followed.

[0004] However, in existing technologies, there are structures where the bottom surfaces of the two longitudinal steel beams of the bridge deck are not on the same horizontal plane along their length. For example, the bottom surfaces of the two longitudinal steel beams are inverted V-shaped, with the middle higher and the ends lower, meaning that the bottom surfaces of both longitudinal steel beams of the bridge deck have a longitudinal slope shape, with the middle higher and the ends lower. For the jacking construction of a lower-bearing steel truss arch bridge with this type of longitudinal steel beam bottom surface shape, the construction process is complicated. During the jacking process, the elevation of the walking jacks on each temporary pier needs to be adjusted to adapt to the longitudinal slope of the bottom surface of the steel beam, which is cumbersome and inefficient.

[0005] Technicians have proposed a leveling structure to solve the above-mentioned technical problems. This involves adding a pad beam to the bottom surface of each longitudinal steel beam of the inverted V-shaped main steel beam, which is higher in the middle and lower at both ends along its length. The bottom surface of the pad beam is horizontal, and the top surface of the pad beam matches the slope of the bottom surface of the inverted V-shaped steel longitudinal beam. Using this structure essentially solves the aforementioned technical problems, and the jacking construction process can adapt to the needs of bridge jacking with longitudinal slopes on the bottom surface of the steel longitudinal beams without requiring adjustments to the jack elevation.

[0006] However, the above structure still has the following shortcomings: 1. Since each steel guide beam is welded and fixed to each of the two steel longitudinal beams of the bridge deck steel beam, after the jacking construction is completed, the steel guide beams at both ends of each steel longitudinal beam are cut off. The welding and cutting process inevitably damages the mechanical properties and steel structure of the two steel longitudinal beams in the bridge deck steel beam. Moreover, in order to avoid minimizing this damage, the construction personnel have to adopt a series of protective measures such as a large number of reinforcement structures and support structures beyond the normal connection points on the two steel longitudinal beams of the bridge deck steel beam and their respective steel guide beams, which not only greatly increases the material cost and labor cost, but also reduces the construction efficiency. 2. For construction sites, even if the longitudinal slope of the steel beams on the bridge deck is only 1%, it's normal for the height from several hundred meters to the highest point to be about two meters. Since the support beam is a single unit, both solid and hollow steel box girder structures consume a lot of steel. The steel consumption for solid beams is understandable, but for hollow support beams, the higher the beam, the more vertical supports are needed, the smaller the spacing between them, and the greater the thickness of each support, resulting in even more steel consumption. 3. This integral support beam is only suitable for specific bridges and can only be used once. Its applicability is limited, and its versatility is weak. Summary of the Invention

[0007] One technical problem this invention aims to solve is to provide an auxiliary device for the jacking construction of a lower-bearing steel truss arch bridge that does not damage the main steel beams of the bridge during the jacking construction process, requires only normal reinforcement and support structures at the connection of the steel guide beams, and relatively saves steel.

[0008] One technical solution of the present invention is to provide an auxiliary device for the jacking construction of a bottom-bearing steel truss arch bridge, comprising a walking jack located on top of two rows of temporary piers and two steel pad beams between two steel longitudinal beams with an inverted V-shaped longitudinal slope along the length direction, the top and bottom planes of each steel pad beam being parallel. Multiple steel pad bases are fixed on the top plane of each steel pad beam, and a steel pad block is detachably connected to each steel pad base. The bottom of each steel pad block is connected to the steel pad. The base blocks are detachably connected or detachably connected to the steel pad block base via one or more intermediate steel transition blocks. The top surface of each steel pad block has the same slope as the bottom slope of the corresponding longitudinal steel beam and fits together. The length of each steel pad beam is shorter than the length of each longitudinal steel beam. Each steel pad beam has its own steel guide beam fixedly connected to both ends. Each steel pad beam and the steel guide beams at both ends are a whole. The steel guide beams at both ends of each steel pad beam are the steel guide beams that were cut off after the under-bearing steel truss arch bridge was pushed into place.

[0009] With the above structure, the auxiliary device for the jacking construction of the under-deck steel truss arch bridge of the present invention has the following advantages: Because the bottom surface of the steel pad beam is a flat plane, like a horizontal plane, and because the top surface of each steel pad block is consistent with the slope of the bottom slope of the steel longitudinal beam at its length and fits together, the top plane of the steel pad beam and the inverted V-shaped longitudinal slope of the steel longitudinal beam are supported by multiple steel pad block bases and steel pad blocks, or multiple steel pad block bases, steel intermediate transition blocks and steel pad blocks. During the jacking construction of the under-deck steel truss arch bridge, the elevation of the walking jacks does not need to be adjusted, and it can adapt to the jacking of the longitudinal slope of the bottom surface of the steel longitudinal beam. It can smoothly, reliably and stably jack the under-deck steel truss arch bridge with the inverted V-shaped longitudinal slope section by section until the ends of the steel longitudinal beam are directly above the permanent piers. Furthermore, the walking jacks are evenly stressed, ensuring that each walking jack has good load-bearing capacity and jacking capacity. The jacking construction of the under-deck steel truss arch bridge is simple to operate, safe, and efficient.

[0010] Furthermore, since the length of the steel pad beam is shorter than the length of the longitudinal steel beams in the bridge deck steel beams, it facilitates the lower ends of the longitudinal steel beams to fall onto the permanent piers after the under-deck steel truss arch bridge is pushed into place, and further facilitates their placement onto the permanent supports at the top of the permanent piers as described below. Also, since the steel pad beam and the steel guide beam are an integral unit, the steel guide beam fully utilizes its role in guiding the steel pad beam, i.e., the entire under-deck steel truss arch bridge, to the predetermined position, while ensuring that the steel guide beam structure, integrated with the steel pad beam, is robust, has strong load-bearing capacity, good mechanical properties, and a smooth transition between the steel guide beam and the steel pad beam. This allows the under-deck steel truss arch bridge, after being pushed into place, to be smoothly, stably, and reliably placed onto the permanent supports as described below.

[0011] Because each steel guide beam is not welded to each of the two longitudinal steel beams of the bridge deck steel beam, but is integrated with the steel pad beam as a whole, the damage to the longitudinal steel beams of the main steel beam caused by welding and cutting during the jacking construction is completely avoided. This effectively ensures the excellent mechanical properties and high-quality steel structure of the main steel beam. Furthermore, at the connection between the steel guide beam and each steel pad beam, since it is a single integral steel beam, only the normal reinforcement structure is required, without the need for excessive reinforcement and support structures to protect the main steel beam. This significantly reduces material and labor costs and greatly improves construction efficiency.

[0012] Since the steel pad beam can use the following common steel box girder, it can be reused, and its height is generally less than one meter. In particular, the space with a height of about 2 meters in the middle formed by the longitudinal slope shape of the two steel longitudinal beams of the bridge deck steel beam with the bottom surface of the two beams being higher in the middle and lower at both ends is supported by a first steel pad block assembly consisting of steel pad block bases and steel pad blocks arranged at intervals in the extension direction, and a second steel pad block assembly consisting of steel pad block bases, one or more steel intermediate transition blocks and steel pad blocks. This not only fully guarantees the high quality requirements of strength and rigidity of the support for the bridge deck steel beam during the jacking construction of the under-deck steel truss arch bridge, but also saves a lot of steel compared to the integral pad beam.

[0013] Furthermore, since the top plane of the steel pad beam is fixed to multiple steel pad bases, and each steel pad base is detachably connected to a steel pad block, the bottom of each steel pad block is detachably connected to the steel pad base to form a first steel pad block assembly. The bottom of each steel pad block is detachably connected to the steel pad base via one or more steel intermediate transition blocks to form a second steel pad block assembly. During steel casting, even for the second steel pad block assembly, only three molds are needed: the steel pad base mold, the steel intermediate transition block mold, and the steel pad block mold. The shapes and dimensions of the multiple steel pad bases are all the same, the shapes and dimensions of the multiple steel intermediate transition blocks are all the same, and the shapes and dimensions of the multiple steel pad blocks are all the same. Because the height can be adjusted using multiple steel intermediate transition blocks, such as two to nine blocks, and the positions of each set of first and second steel pad components along the length of the steel pad beam can be fine-tuned, it's easy to understand that fine-tuning is done before welding the steel pad components. Therefore, each set of first and second steel pad components can be fully compacted to bear the weight of the under-deck steel truss arch bridge, and the process of fixing them to the steel longitudinal beams is also very convenient. This auxiliary device is highly versatile, reusable, and adaptable to the jacking construction of under-deck steel truss arch bridges of different sizes and longitudinal slopes. It has a wide range of applications, strong versatility, and significant cost-saving economic benefits.

[0014] Furthermore, each steel support beam is a steel box girder, and the cross-section of each steel support beam is a trapezoid, wider at the top and narrower at the bottom. With this structure, the steel support beams exhibit better mechanical properties, are more robust, stable, and reliable, and the manufacturing process is mature, further improving construction efficiency.

[0015] Furthermore, the steel guide beams at both ends of each steel pad beam are extensions of a trapezoidal steel box girder with a cross-section that is larger at the top and smaller at the bottom. This structure further ensures the robustness, high load-bearing capacity, and good mechanical properties of the steel guide beam structure integrated with the steel pad beam, as well as a smooth transition between the steel guide beam and the steel pad beam.

[0016] Furthermore, taking the middle of the steel longitudinal beam as the boundary, the top surfaces of the steel pads on the left end are all sloping surfaces, with the left side lower than the right side, and the number of intermediate steel transition blocks on the left end decreases from the middle to the left. Similarly, the top surfaces of the steel pads on the right end are all sloping surfaces, with the right side lower than the left side, and the number of intermediate steel transition blocks on the right end decreases from the middle to the right. This structure ensures that the top surface of each steel pad has the same slope as the bottom slope of the steel longitudinal beam at its corresponding position, resulting in better contact and compaction between the steel pad beam, the steel pads on the base of the multiple steel pads, the intermediate steel transition blocks on the base of the steel pads, and the steel pads themselves, and the inverted V-shaped longitudinal beam. This further guarantees the smooth, reliable, and stable jacking of the under-braced steel truss arch bridge with the inverted V-shaped longitudinal beam, ensuring that each jack has excellent load-bearing and jacking capacity.

[0017] Furthermore, each steel pad beam is welded and fixed to multiple steel pad bases. With the above structure, the steel pad bases and steel pad beams are welded together, which improves the mechanical properties of this auxiliary device, making the structure more robust, stable, and reliable. This further ensures the technical effect of simple operation, safe construction, and high construction efficiency in the jacking construction of the under-deck steel truss arch bridge.

[0018] Furthermore, the bottom plane of each steel pad block is in contact with the top plane of each steel pad block base or the top plane of each steel intermediate transition block; the top plane of each steel intermediate transition block is in contact with the bottom plane of each steel pad block or the bottom plane of another steel intermediate transition block; the bottom plane of each steel intermediate transition block is in contact with the top plane of another steel intermediate transition block or the top plane of each steel pad block base; the top plane of each steel pad block base is in contact with the bottom plane of the steel intermediate transition block or the bottom plane of the steel pad block. With the above structure, the fit between the steel pad block base and the steel pad blocks themselves, or between the steel pad block base and the steel intermediate transition block and between the steel pad blocks themselves, is better, resulting in stronger compaction and further ensuring the good load-bearing capacity and jacking capacity of this auxiliary device.

[0019] Furthermore, each steel pad base has a first rectangular groove with an upward opening. The bottom of each steel pad and the bottom of each intermediate transition block have a protruding rectangular block. The protruding rectangular blocks at the bottom of each steel pad or intermediate transition block are vertically inserted into the first rectangular groove. Each intermediate transition block has a second rectangular groove with an upward opening for vertically inserting the protruding rectangular blocks at the bottom of the steel pad or intermediate transition block. With this structure, the steel pads and steel pad bases can be connected before hoisting the steel longitudinal beam, or the steel pads, intermediate transition blocks, and steel pad bases can be connected first. This makes the connection structure more robust, stable, and reliable. It also makes it easier to adjust the height of the first and second steel pad assemblies by changing different quantities, thus broadening the applicability and versatility of the first and second steel pad assemblies.

[0020] Furthermore, each of the two steel guide beams at each end is welded to a reinforcement structure consisting of multiple horizontal connecting rods and multiple diagonal connecting rods. This structure ensures the steel guide beams are structurally sound, have good mechanical properties, and strong load-bearing capacity, while eliminating the need for excessive reinforcement and support structures, thus further saving material and labor costs and improving construction efficiency.

[0021] Furthermore, on both sides of the width direction of the under-deck steel truss arch bridge, the steel pad beams, steel guide beams, and multiple steel pad bases fixed on the steel pad beams, as well as the detachably connected steel pads and steel intermediate transition blocks, are all symmetrically arranged: their quantity, shape, position, and size are all identical. With this structure, the under-deck steel truss arch bridge exhibits better symmetry on both sides of its width direction, better mechanical properties, and stronger load-bearing capacity. The synchronization of the jacking process on both sides is also improved, further ensuring the smooth, reliable, and stable jacking of the under-deck steel truss arch bridge with its inverted V-shaped longitudinal slope, with each jack possessing excellent load-bearing and jacking capabilities.

[0022] Another technical problem that this invention aims to solve is to provide a method for launching a lower-bearing steel truss arch bridge that does not damage the main steel beams of the bridge during the launching process, requires only normal reinforcement and support structures at the connection of the steel guide beams, and saves relatively much steel.

[0023] Another technical solution of the present invention is to provide a method for jacking a lower-bearing steel truss arch bridge using the auxiliary device described in the above-mentioned corresponding technical solutions, comprising the following construction steps: 1) Prefabricate two steel pad beams and steel guide beams with a trapezoidal cross-section that is larger at the top and smaller at the bottom, and hoist them onto the temporary supports of multiple temporary piers on the shore. The middle part of the length is the steel pad beam, and the extended parts at both ends are steel guide beams. The two steel guide beams at each end are welded together with a reinforcing structure. Weld multiple prefabricated steel pad bases along the length direction on the top plane of each steel pad beam. Insert a steel pad block vertically into each steel pad base, or insert one or more steel intermediate transition blocks vertically between the steel pad base and the steel pad block. Hoist the bridge deck steel beams onto the two steel pad beams located on the shore and press them firmly onto the top surface of the multiple steel pad blocks. The top surface of each steel pad block has the same slope as the bottom slope of the longitudinal steel beam at its length position and fits together. Then assemble the under-deck steel truss arch bridge. 2) The under-deck steel truss arch bridge is assembled by jacking and pushing using the slide rails and jacking equipment set on the top of each temporary pier. During the jacking construction, there is no need to adjust the elevation of the walking jacks. The top surface of the two temporary supports at both ends of the walking jack slide is higher than the top surface of the permanent pier, so that the top surface of the permanent pier does not interfere with the movement of the steel guide beam and steel pad beam along the length direction. After each walking jack has completed a section of slide, all walking jacks retract their piston rods, so that the steel pad beam and steel guide beam are temporarily placed on the top plane of the temporary supports of the two rows of temporary piers on both sides of the width direction of the bridge. Each walking jack then returns to the beginning of the slide stroke at the top of each temporary pier. This process is repeated until the under-deck steel truss arch bridge is pushed as a whole to the point where the ends of the steel longitudinal beams are directly above the preset permanent piers. 3) Cut and remove all four steel guide beams, including their respective reinforcement structures, from both ends; 4) Fix four permanent supports to the top of the four permanent piers, and the top plane of each permanent support is higher than the top plane of the temporary support at the top of the temporary pier. 5) Lower the height of the piston rods of all walking jacks so that the two ends of the lower-bearing steel truss arch bridge in the length direction and the two sides in the width direction are pressed firmly onto the four permanent supports of the four permanent piers. Then remove all the steel pads and dismantle and lift away the steel pad beams and the steel pad bases welded to the top plane of the steel pad beams.

[0024] After adopting the above construction steps, the method for jacking construction of the under-deck steel truss arch bridge of the present invention has the following advantages: Because the bottom surface of the steel pad beam is a flat plane, like a horizontal plane, and because the top surface of each steel pad block is consistent with the slope of the bottom slope of the steel longitudinal beam at its length and fits together, the top plane of the steel pad beam and the inverted V-shaped longitudinal slope of the steel longitudinal beam are supported by multiple steel pad block bases and steel pad blocks, or multiple steel pad block bases, steel intermediate transition blocks and steel pad blocks. During the jacking construction of the under-deck steel truss arch bridge, the elevation of the jacks does not need to be adjusted, and it can adapt to the jacking of the longitudinal slope of the bottom surface of the steel longitudinal beam. It can smoothly, reliably and stably jack the under-deck steel truss arch bridge with the inverted V-shaped longitudinal slope section by section until both ends of the steel longitudinal beam are directly above the permanent piers. Furthermore, the force on the jacks is balanced, ensuring that each jack has good load-bearing capacity and jacking capacity. The jacking construction of the under-deck steel truss arch bridge is simple to operate, safe to construct, and highly efficient.

[0025] Furthermore, since the length of the steel pad beam is shorter than the length of the longitudinal steel beams in the bridge deck steel beams, it facilitates the lower ends of the longitudinal steel beams to fall onto the permanent piers after the under-deck steel truss arch bridge is pushed into place, and further facilitates their placement onto the permanent supports at the top of the permanent piers as described below. Also, since the steel pad beam and the steel guide beam are an integral unit, the steel guide beam fully utilizes its role in guiding the steel pad beam, i.e., the entire under-deck steel truss arch bridge, to the predetermined position, while ensuring that the steel guide beam structure, integrated with the steel pad beam, is robust, has strong load-bearing capacity, good mechanical properties, and a smooth transition between the steel guide beam and the steel pad beam. This allows the under-deck steel truss arch bridge, after being pushed into place, to be smoothly, stably, and reliably placed onto the permanent supports as described below.

[0026] Because each steel guide beam is not welded to each of the two longitudinal steel beams of the bridge deck steel beam, but is integrated with the steel pad beam as a whole, the damage to the longitudinal steel beams of the main steel beam caused by welding and cutting during the jacking construction is completely avoided. This effectively ensures the excellent mechanical properties and high-quality steel structure of the main steel beam. Furthermore, at the connection between the steel guide beam and each steel pad beam, since it is a single integral steel beam, only the normal reinforcement structure is required, without the need for excessive reinforcement and support structures to protect the main steel beam. This significantly reduces material and labor costs and greatly improves construction efficiency.

[0027] Since steel pad beams can use common steel box girders, are reusable, and are generally less than one meter high, especially since the space of about 2 meters in height in the middle is formed by the longitudinal slope shape of the two steel longitudinal beams of the bridge deck steel beam with the bottom surface being higher in the middle and lower at both ends, the pad block assembly set at intervals in the extension direction is supported by steel pad block base, one or more steel intermediate transition blocks in the middle, and steel pad blocks. This can not only fully guarantee the high quality requirements of strength and rigidity of the support for the bridge deck steel beam during the jacking construction of the under-deck steel truss arch bridge, but also save a lot of steel compared to the integral pad beam.

[0028] Furthermore, since the top plane of the steel pad beam is fixed to multiple steel pad bases, and each steel pad base is detachably connected to a steel pad block, with the bottom of each steel pad block detachably connected to the base to form a first steel pad block assembly, and the bottom of each steel pad block is detachably connected to the base via one or more intermediate steel transition blocks to form a second steel pad block assembly, only three molds are needed for the second steel pad block assembly during casting: a steel pad base mold, an intermediate steel transition block mold, and a steel pad block mold. The shapes and dimensions of the multiple steel pad bases, intermediate steel transition blocks, and steel pad blocks are all identical. Because the height can be adjusted using multiple intermediate steel transition blocks (e.g., two to nine), and the positions of each first and second steel pad block assembly along the length of the steel pad beam can be finely adjusted, each first and second steel pad assembly can be fully compacted to bear the weight of the under-deck steel truss arch bridge, and is also very convenient to fix to the steel longitudinal beams. This auxiliary device is highly versatile and reusable. It can be adapted to the jacking construction of under-deck steel truss arch bridges of different sizes and longitudinal slopes. It has a wide range of applications, strong versatility, and significant cost-saving economic benefits. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the auxiliary device of the present invention applied during the jacking construction of a lower-bearing steel truss arch bridge. Figure 1 (The arch bridge has been pushed to the installation position.) Figure 4 Similarly; it can be understood as being pushed over from the left bank; looking down from above.

[0030] Figure 2 yes Figure 1 A magnified structural diagram of A in the diagram.

[0031] Figure 3 yes Figure 1 A magnified structural diagram of B in the diagram.

[0032] Figure 4 This is a schematic diagram of the auxiliary device of the present invention applied during the jacking construction of a lower-bearing steel truss arch bridge. Figure 2 (Side view from above).

[0033] Figure 5 This is a schematic diagram of the auxiliary device structure of the present invention (the right end is omitted; a steel pad beam is shown but a steel guide beam is not shown; a steel longitudinal beam is shown; several sets of first steel pad block assemblies and second steel pad block assemblies are schematically shown: a steel pad block base and a steel pad block of the first set of first steel pad block assemblies at the left end; a steel pad block base, a steel intermediate transition block, and a steel pad block of the second set of second steel pad block assemblies at the left end; a steel pad block base, two steel intermediate transition blocks, and a steel pad block of the third set of second steel pad block assemblies at the left end; a steel pad block base, three steel intermediate transition blocks, and a steel pad block of the fourth set of second steel pad block assemblies at the left end;) Figure 6 yes Figure 5 Exploded view of the second steel pad assembly of the third group at the middle left end. Figure 1 (face).

[0034] Figure 7 yes Figure 5 Exploded view of the second steel pad assembly of the third group at the middle left end. Figure 2 (Looking down from above).

[0035] Figure 8 yes Figure 5 Exploded view of the second steel pad assembly of the third group at the middle left end. Figure 3 (Looking up).

[0036] The diagram shows: 1. Reinforced structure; 2. Second steel pad assembly; 3. Steel arch beam; 4. Steel crossbeam; 5. Steel longitudinal connecting rod; 6. Steel longitudinal beam; 7. Vertical steel support; 8. Walking jack; 9. Foundation; 10. Steel guide beam; 11. Permanent pier; 12. Temporary pier; 13. Steel pad beam; 14. Temporary support column; 15. Steel pad; 16. Steel pad base; 17. Slide; 18. Steel intermediate transition block; 19. Diagonal connecting rod; 20. Horizontal connecting rod; 21. Convex rectangular block; 22. Second rectangular groove; 23. First rectangular groove; 24. First steel pad assembly; 25. End. Detailed Implementation

[0037] The specific embodiments of the present invention will be further described below with reference to the accompanying drawings. It should be noted that these descriptions of specific embodiments are for the purpose of aiding understanding the present invention, but do not constitute a limitation thereof. Furthermore, the technical means involved in the various specific embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0038] like Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7and Figure 8 As shown.

[0039] Existing technology for under-deck steel truss arch bridges includes a steel arch beam 3, a bridge deck steel beam, and multiple vertical steel supports 7. The bridge deck steel beam of the under-deck steel truss arch bridge includes two steel longitudinal beams 6 symmetrically arranged on both sides of the bridge width, multiple steel transverse beams 4 fixed to the two steel longitudinal beams 6, and multiple steel longitudinal connecting rods 5 fixed to the multiple steel transverse beams 4 and located in the middle of the bridge width. Existing technology for jacking construction generally involves first constructing multiple permanent piers 11 and multiple temporary piers 12 fixed to the foundation 9 or riverbed, assembling the under-deck steel truss arch bridge on the bank, and then using the sliding rails 17 set on the top of each temporary pier 12, jacking equipment such as walking jacks 8, and two temporary supports 14 fixed to each temporary pier 12 along the length of the bridge to jack the assembled under-deck steel truss arch bridge on the bank onto the permanent pier 11 and position it. Then dismantle the equipment and temporary piers 12, including temporary support columns 14, such as by dismantling and lifting the walking jacks 8, and removing multiple temporary piers 12, including temporary support columns 14. It is not difficult to understand that multiple permanent piers 11 and multiple temporary piers 12 are symmetrically arranged on both sides of the width direction of the under-bearing steel truss arch bridge, and the slide rails 17 and jacking equipment such as walking jacks 8 on the top of each temporary pier 12 are also symmetrically arranged.

[0040] This invention relates to an auxiliary device for the jacking construction of a bottom-bearing steel truss arch bridge, comprising a walking jack 8 located on top of two rows of temporary piers 12, and two steel pad beams 13 between two steel longitudinal beams 6 with an inverted V-shaped longitudinal slope that is higher in the middle and lower at both ends along the length direction. The top and bottom planes of each steel pad beam 13 are parallel, and multiple steel pad bases 16 are fixed on the top plane of each steel pad beam 13. Each steel pad base 16 is detachably connected to a steel pad block 15. The bottom of each steel pad block 15 is detachably connected to the steel pad base 16 or detachably connected to the steel pad base 16 via one or more steel intermediate transition blocks 18. The top surface of each steel pad block 15 has the same slope as the bottom slope of the steel longitudinal beam 6 at its length position and fits snugly against each other. The length of each steel pad beam 13 is shorter than the length of each steel longitudinal beam 6. Each steel pad beam 13 is fixedly connected to its own steel guide beam 10 at both ends. Each steel pad beam 13 and the steel guide beams 10 at both ends are an integral unit. The steel guide beams 10 at both ends of each steel pad beam 13 are the steel guide beams 10 that were cut off after the under-bearing steel truss arch bridge was pushed into place.

[0041] Each steel pad beam 13 is a steel box beam, and the cross-section of each steel pad beam 13 is a trapezoid with a larger top and a smaller bottom.

[0042] The steel guide beams 10 at both ends of each steel pad beam 13 are extensions of a steel box beam with a trapezoidal cross-section that is larger at the top and smaller at the bottom.

[0043] Among the multiple steel pads 15, the top surface of the multiple steel pads 15 on the left end is a slope that is lower on the left and higher on the right, with the middle of the length of the steel longitudinal beam 6 as the boundary. The number of steel intermediate transition blocks 18 on the left end decreases from the middle to the left end. The top surface of the multiple steel pads 15 on the right end is a slope that is lower on the right and higher on the left, with the number of steel intermediate transition blocks 18 on the right end decreasing from the middle to the right end.

[0044] Each steel pad beam 13 is welded and fixed to multiple steel pad bases 16.

[0045] The bottom surface of each steel pad 15 is abutted against the top surface of each steel pad base 16 or the top surface of each steel intermediate transition block 18. The top surface of each steel intermediate transition block 18 is abutted against the bottom surface of each steel pad 15 or the bottom surface of another steel intermediate transition block 18. The bottom surface of each steel intermediate transition block 18 is abutted against the top surface of another steel intermediate transition block 18 or the top surface of each steel pad base 16. The top surface of each steel pad base 16 is abutted against the bottom surface of the steel intermediate transition block 18 or the bottom surface of the steel pad 15.

[0046] Each steel pad base 16 has a first rectangular groove 23 with an upward opening. The bottom of each steel pad 15 and the bottom of each steel intermediate transition block 18 have a downward-protruding rectangular block 21. The downward-protruding rectangular block 21 of each steel pad 15 or each steel intermediate transition block 18 is vertically inserted into the first rectangular groove 23. Each steel intermediate transition block 18 has a second rectangular groove 22 with an upward opening for vertically inserting the downward-protruding rectangular block 21 of the bottom of the steel pad 15 or the downward-protruding rectangular block 21 of the bottom of the steel intermediate transition block 18. A steel pad base 16 and a steel pad 15 from bottom to top can be referred to as a first steel pad assembly 24. A steel pad base 16, one or more steel intermediate transition blocks 18, and a steel pad 15 from bottom to top can be referred to as a second steel pad assembly 2.

[0047] Each group of first steel pad components can also be fixed by one or more steel screws, such as two screws: each steel pad has one or more vertical countersunk holes, and the bottom wall of the groove of each steel pad base has one or more threaded holes corresponding to the vertical countersunk holes. One or more screws pass through the vertical countersunk holes and are tightened in one or more threaded holes, with the top surface of the screw lower than the top surface of the steel pad.

[0048] Each group of second steel pad components can also be fixed by one or more steel screws, such as two screws: each steel pad has one or more vertical countersunk holes, one or more steel intermediate transition plates have one or more vertical through holes, and the bottom wall of the groove of each steel pad base has one or more threaded holes corresponding to the vertical countersunk holes and vertical through holes. One or more screws pass through the vertical countersunk holes and vertical through holes and are tightened in one or more threaded holes, with the top surface of the screw lower than the top surface of the steel pad.

[0049] Two steel guide beams 10 at each end are welded together with a reinforcement structure 1 consisting of multiple horizontal connecting rods 20 and multiple diagonal connecting rods 19.

[0050] On both sides of the width direction of the under-bearing steel truss arch bridge, the steel pad beam 13, the steel guide beam 10, and the multiple steel pad block bases 16 fixed on the steel pad beam 13, as well as the detachably connected steel pad blocks 15 and steel intermediate transition blocks 18 are all symmetrically arranged: the quantity, shape, position and size are all the same.

[0051] It is easy to understand that the steel pad beam 13 and the steel guide beam 10 are an integral unit, preferably integrally formed as a whole such as a steel box beam of integral length, but it may also include a steel box beam with a steel pad beam in the middle and two steel box beams at both ends welded together as steel guide beams. Of course, the upper and lower planes of the welded steel box beam are both straight lines and smooth transition surfaces.

[0052] The present invention employs the auxiliary device described in the corresponding technical solution for the jacking construction method of a lower-bearing steel truss arch bridge, comprising the following construction steps: 1) Two prefabricated steel pad beams 13 and steel guide beams 10, with a cross-section that is larger at the top and smaller at the bottom, are hoisted onto temporary supports 14 of multiple temporary piers 12 on the shore. The middle section is the steel pad beam 13, and the extended sections at both ends are the steel guide beams 10. The two steel guide beams 10 at each end are welded together with a reinforcing structure 1. Multiple prefabricated steel pad bases 16 are welded along the length direction on the top plane of each steel pad beam 13. A steel pad block 15 is vertically inserted into each steel pad base 16, or one or more steel intermediate transition blocks 18 are vertically inserted between the steel pad base 16 and the steel pad block 15. The bridge deck steel beams are hoisted onto the two steel pad beams 13 located on the shore and pressed firmly onto the top surface of the multiple steel pad blocks 15. The top surface of each steel pad block 15 has the same slope as the bottom slope of the steel longitudinal beam 6 at its length position and fits together. Then, the under-deck steel truss arch bridge is assembled.

[0053] 2) The lower-bearing steel truss arch bridge is assembled by jacking using the slide rails 17 and jacking equipment located on the top of each temporary pier 12. During the jacking process, the elevation of the walking jacks 8 does not need to be adjusted, and the top surface height of the two temporary supports 14 at both ends of the slide rails 17 of the walking jacks 8 is higher than the top surface height of the permanent piers 11, so that the top surface of the permanent piers 11 does not interfere with the movement of the steel guide beams 10 and steel pad beams 13 along their length. Each walking jack 8 has one section... After the slide 17 has completed its stroke, all the walking jacks 8 retract their piston rods, causing the steel pad beam 13 and the steel guide beam 10 to be temporarily placed on the top plane of the temporary support 14 of the two rows of temporary piers 12 on both sides of the bridge's width direction. Each walking jack 8 then returns to the starting end of the slide 17 stroke at the top of each temporary pier 12. This process is repeated until the entire lower-bearing steel truss arch bridge is pushed up until the ends 25 of the steel longitudinal beam 6 are directly above the preset permanent piers 11.

[0054] 3) Cut and remove the four steel guide beams 10 at both ends, including their respective reinforcing structures 1. Cut the steel guide beams 10, such as by using an electric saw or an oxyacetylene torch, and then remove them by a crane.

[0055] 4) Four permanent supports are fixed to the top of the four permanent piers 11. The top plane of each permanent support is higher than the top plane of the temporary support 14 at the top of the temporary pier 12. It is easy to understand that fixing permanent supports is a conventional construction technique. For example, for a steel permanent pier 11, a permanent support with the same cross-section is welded to the top of the permanent pier 11. For a reinforced concrete permanent pier 11, the reinforcing bars of the permanent support are first welded to the pre-reserved reinforcing bars at the top of the permanent pier 11, and then the reinforced concrete permanent support with the same cross-section is poured. It is easy to understand that the top plane of the aforementioned permanent pier 11 is lower than the top plane of the temporary support 14 to avoid interference. If it is a reinforced concrete permanent pier 11, the pre-reserved reinforcing bars on the top plane are bent flat, and their top surface is also lower than the top plane of the temporary support 14 to avoid interference. The height of the top plane of the permanent support is higher than the height of the top planes of the two temporary supports 14 at the top of the temporary pier 12. The walking jack 8 can be seen as a combination of a vertical hydraulic cylinder and a horizontal hydraulic cylinder, which can both lift and move horizontally to achieve the function of pushing.

[0056] 5) Lower the height of the piston rods of all walking jacks 8, such as... Figure 1 As shown, the ends 25 of the two steel longitudinal beams 6 are pressed firmly onto the four permanent supports of the four permanent piers 11. Then, all steel pads 15 and all steel intermediate transition blocks 18 are removed, and the steel pad beam 13 and the steel pad base 16 welded to the top plane of the steel pad beam 13 are disassembled and lifted away for reuse.

[0057] Components, structures, or quantities not marked above are not shown in the drawings (e.g., permanent supports, steel screws, and holes are not shown). The drawings are for illustrative purposes only; in case of discrepancies between the drawings and the text description, or between the drawings themselves, the text description shall prevail.

[0058] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. An auxiliary device for the jacking construction of a bottom-bearing steel truss arch bridge, comprising walking jacks located on top of multiple temporary piers in two rows, multiple steel pads, and steel guide beams at both ends; characterized in that: It also includes two steel pad beams between two steel longitudinal beams whose bottom surfaces have an inverted V-shaped longitudinal slope that is higher in the middle and lower at both ends along the length direction; The top and bottom planes of each steel pad beam are parallel. Multiple steel pad bases are fixed on the top plane of each steel pad beam. A steel pad block is detachably connected to each steel pad base. The bottom of each steel pad block is detachably connected to the steel pad base or detachably connected to the steel pad base via one or more steel intermediate transition blocks. The top surface of each steel pad block has the same slope as the bottom slope of the length position of each steel longitudinal beam and fits together. Each steel pad beam is shorter than the length of each steel longitudinal beam, so that the ends of the steel longitudinal beams can fall onto the permanent piers after the under-deck steel truss arch bridge is pushed into place. Each steel pad beam is fixedly connected to its own steel guide beam at both ends. Each steel pad beam and the steel guide beams at both ends are a whole. The steel guide beams at both ends of each steel pad beam are the steel guide beams that were cut off after the under-bearing steel truss arch bridge was pushed into place.

2. The auxiliary device for jacking construction of a lower-bearing steel truss arch bridge according to claim 1, characterized in that: Each steel pad beam is a steel box beam, and the cross-section of each steel pad beam is a trapezoid with a larger top and a smaller bottom.

3. The auxiliary device for jacking construction of a lower-bearing steel truss arch bridge according to claim 2, characterized in that: The steel guide beams at both ends of each steel pad beam are extensions of a steel box girder with a trapezoidal cross-section that is larger at the top and smaller at the bottom.

4. The auxiliary device for jacking construction of a lower-bearing steel truss arch bridge according to claim 1, characterized in that: Among the multiple steel pads, the top surface of the multiple steel pads on the left end is a slope that is lower on the left and higher on the right, with the number of intermediate steel transition blocks on the left decreasing from the middle to the left. The top surface of the multiple steel pads on the right end is a slope that is lower on the right and higher on the left, with the number of intermediate steel transition blocks on the right decreasing from the middle to the right.

5. The auxiliary device for jacking construction of a lower-bearing steel truss arch bridge according to claim 1, characterized in that: Each steel pad beam is welded and fixed to multiple steel pad bases.

6. The auxiliary device for jacking construction of a lower-bearing steel truss arch bridge according to claim 5, characterized in that: The bottom plane of each steel pad is in contact with the top plane of each steel pad base or the top plane of each steel intermediate transition block; the top plane of each steel intermediate transition block is in contact with the bottom plane of each steel pad or the bottom plane of another steel intermediate transition block; the bottom plane of each steel intermediate transition block is in contact with the top plane of another steel intermediate transition block or the top plane of each steel pad base; the top plane of each steel pad base is in contact with the bottom plane of the steel intermediate transition block or the bottom plane of the steel pad.

7. The auxiliary device for jacking construction of a lower-bearing steel truss arch bridge according to claim 6, characterized in that: Each steel pad base has a first rectangular groove with an upward opening. The bottom of each steel pad and the bottom of each steel intermediate transition block have a downward convex rectangular block. The downward convex rectangular block at the bottom of each steel pad or the downward convex rectangular block at the bottom of each steel intermediate transition block is vertically inserted into the first rectangular groove. Each steel intermediate transition block has a second rectangular groove with an upward opening for vertically inserting the downward convex rectangular block at the bottom of the steel pad or the downward convex rectangular block at the bottom of the steel intermediate transition block.

8. The auxiliary device for jacking construction of a bottom-bearing steel truss arch bridge according to claim 1, characterized in that: The two steel guide beams at each end are welded together by a reinforcement structure consisting of multiple horizontal connecting rods and multiple diagonal connecting rods.

9. The auxiliary device for launching a steel truss arch bridge according to any one of claims 1-8, characterized in that: On both sides of the width direction of the under-bearing steel truss arch bridge, the steel pad beams, steel guide beams, and multiple steel pad bases fixed on the steel pad beams, as well as the detachably connected steel pads and steel intermediate transition blocks are symmetrically arranged: the quantity, shape, position and size are all the same.

10. A method for jacking a lower-bearing steel truss arch bridge using the auxiliary device described in claim 9, comprising setting up walking jacks for jacking on top of multiple temporary piers; the method further comprises the following construction steps: 1) Prefabricate two steel pad beams and steel guide beams with a trapezoidal cross-section that is larger at the top and smaller at the bottom, and hoist them onto the temporary supports of multiple temporary piers on the shore. The middle part of the length is the steel pad beam, and the extended parts at both ends are steel guide beams. The two steel guide beams at each end are welded together with a reinforcing structure. Weld multiple prefabricated steel pad bases along the length direction on the top plane of each steel pad beam. Insert a steel pad block vertically into each steel pad base, or insert one or more steel intermediate transition blocks vertically between the steel pad base and the steel pad block. Hoist the bridge deck steel beams onto the two steel pad beams located on the shore and press them firmly onto the top surface of the multiple steel pad blocks. The top surface of each steel pad block has the same slope as the bottom slope of the longitudinal steel beam at its length position and fits together. Then assemble the under-deck steel truss arch bridge. 2) The under-deck steel truss arch bridge is assembled by jacking and pushing using the slide rails and jacking equipment set on the top of each temporary pier. During the jacking construction, there is no need to adjust the elevation of the walking jacks. The top surface of the two temporary supports at both ends of the walking jack slide is higher than the top surface of the permanent pier, so that the top surface of the permanent pier does not interfere with the movement of the steel guide beam and steel pad beam along the length direction. After each walking jack has completed a section of slide, all walking jacks retract their piston rods, so that the steel pad beam and steel guide beam are temporarily placed on the top plane of the temporary supports of the two rows of temporary piers on both sides of the width direction of the bridge. Each walking jack then returns to the beginning of the slide stroke at the top of each temporary pier. This process is repeated until the under-deck steel truss arch bridge is pushed as a whole to the point where the ends of the steel longitudinal beams are directly above the preset permanent piers. 3) Cut and remove all four steel guide beams, including their respective reinforcement structures, from both ends; 4) Fix four permanent supports to the top of the four permanent piers, and the top plane of each permanent support is higher than the top plane of the temporary support at the top of the temporary pier. 5) Lower the height of the piston rods of all walking jacks so that the ends of the two steel longitudinal beams are pressed firmly onto the four permanent supports of the four permanent bridge piers. Then remove all steel pads and all steel intermediate transition blocks, and remove and lift away the steel pad beams and the steel pad bases welded to the top plane of the steel pad beams.

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