An assembled lifting platform

Abstract

The application relates to the field of assembled prefabrication, and discloses an assembled lifting platform, which comprises a lifting frame, a ring beam and an operation platform which are sequentially connected, the lifting frame comprises a plurality of lifting units and horizontally arranged long-strip-shaped supporting units, the lower end of the lifting unit is pre-buried in a poured section of a bridge pier, the lifting unit is connected with the supporting unit, the end of the supporting unit is provided with a vertically arranged frame unit, a scissor support is arranged in the upper part of the frame unit, the ring beam passes through the lower part of the frame unit, the ring beam comprises a plurality of standard truss units, the standard truss units are divided into a plurality of levels according to lengths, the length difference of two adjacent levels of the standard truss units is equal, the adjacent standard truss units are detachably connected to form a ring, the outer side of the ring beam is connected with the operation platform, and the operation platform is fixedly connected with the frame unit. The lifting platform can be rapidly built based on the assembled technology.

Description

Technical Field

[0001] This invention relates to the field of prefabricated construction, and more specifically to a prefabricated lifting platform. Background Technology

[0002] Industrialized construction, intelligent construction, and rapid construction are becoming the main development directions and popular research topics in bridge construction. Various studies are already underway in the construction of mega-bridges and special bridge structures. However, as a crucial component of various bridges, bridge piers have received relatively little research focus on new technologies for their construction. In large-scale bridge projects, apart from special structural forms, bridge piers are typically designed with several typical structural forms. With the development of computational theory, the pier height of many conventional bridges has reached 80-100 meters. This means that in the future, in many areas spanning mountains and valleys, a combination of conventional bridges and high piers will be chosen to improve the level of prefabricated construction in bridge construction.

[0003] In existing technologies, slipform construction is a construction method that involves vertically lifting formwork. It uses a through-hole jack to climb on a support rod, which lifts the lifting frame, formwork, and operating platform together. After each layer of concrete is poured, the formwork is slipped up until the structure is finished. The lifting frame and operating platform are usually connected by a ring beam, which serves as the main load-bearing component to ensure the stability of the overall structure. Therefore, ring beams of different sizes need to be designed according to different structural dimensions. However, the production cycle of such ring beams is long, the turnover rate is low, and they are not convenient to transport. Summary of the Invention

[0004] The present invention aims to provide a prefabricated lifting platform that can be quickly constructed based on prefabricated technology.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: a prefabricated lifting platform, comprising a lifting frame, a ring beam, and an operating platform connected in sequence. The lifting frame includes several lifting units and horizontally arranged elongated support units. The lower end of the lifting unit is pre-embedded in the cast-in-place section of the bridge pier. The lifting unit and the support unit are connected. The end of the support unit is provided with a vertically arranged frame unit. The upper part of the frame unit is provided with scissor bracing. The ring beam passes through the lower part of the frame unit. The ring beam includes several standard truss units. The standard truss units are divided into several levels according to their length. The length difference between two adjacent levels of standard truss units is equal. Adjacent standard truss units can be detachably connected to form a ring. The outer side of the ring beam is connected to the operating platform. The operating platform and the frame unit are fixedly connected.

[0006] The beneficial effects of this plan are: This scheme is applicable to the slipform construction of rectangular piers. Lifting units, support units, frame units, and standard truss units of varying lengths are prefabricated in the factory and transported to the site. They are then assembled according to the actual conditions and pier dimensions. For example, if the lengths of the standard truss units are 1 meter, 2 meters, and 3 meters respectively, then when the required ring beam side length is 7 meters, since 3*2+1=7, each side of the ring beam can be combined using two 3-meter and one 1-meter standard truss units. When pouring the first formwork of the pier, the lower end of the lifting unit is pre-embedded within the already poured section of the pier. The lifting unit, support unit, and frame unit are connected. The assembled 7-meter standard truss unit is passed through the frame unit, and then all the standard truss units are spliced ​​together to form a ring beam. When the required ring beam side length is not a whole meter, the standard truss unit will extend the excess part at the corner of the ring beam to meet the size requirements of the ring beam. Since the ring beam passes through the lower part of the frame unit, the connection position between the ring beam and the frame unit is adjustable. Therefore, this solution facilitates transportation by producing standard truss units in a standardized manner, enabling assembly line production with a short production cycle, easy quality control, and the ability to assemble ring beams of different sizes. It can also be reused multiple times between different piers and projects, resulting in a high turnover rate. Furthermore, the operating platform also includes vertical connecting rods and vertical rod connectors. Both the vertical connecting rods and standard truss units are composed of rectangular tubes. The vertical rod connectors are inverted U-shaped with their openings facing downwards. The upper ends of the vertical rod connectors and vertical connecting rods are bolted together, and the two are fitted onto the rectangular tube of a standard truss unit. The ring beam also includes corner connectors. The corner connectors are "U"-shaped, with their openings facing horizontally. The corner connectors are bolted together with a standard truss unit at a corner position, and the two are fitted onto a rectangular tube of another standard truss unit.

[0007] With this setup, since the standard truss unit is a standard component, the connection position of the standard truss unit at the corner is different when used on different piers, and the connection position of the standard truss unit and the vertical connecting rod is also different. In this solution, the vertical connecting rod can be adjusted within a certain range to connect with the standard truss unit according to the actual situation through the vertical connecting rod connector. Similarly, the connection position of the two standard truss units at the corner can be adjusted within a certain range through the corner connector.

[0008] Furthermore, the support units are arranged in a grid pattern by perpendicularly intersecting each other, forming four overlapping areas. Each overlapping area has a vertical guide hole. Each lifting unit includes a support rod, a through-hole jack, and several telescopic drive components. The through-hole jack has an adjustment part, which is supported below the support unit. The lower end of the support rod is embedded in the already poured section of the pier column, and the upper end of the support rod passes through the through-hole jack, the adjustment part, and the guide hole in sequence. The lower end of the telescopic drive component is hinged to the adjustment part, and the upper end of the output shaft of the telescopic drive component is hinged to the support unit. Each adjustment part and the lower ends of two telescopic drive components are hinged at the same height. The two telescopic drive components are arranged along the length direction of the corresponding support unit and are perpendicular to each other.

[0009] Furthermore, the upper surface of the adjustment part and the lower surface of the support unit are horizontally slidably connected. The adjustment part is a rectangular shell. The overlapping area and the outer contour of the adjustment part are the same. The overlapping area and the projection of the adjustment part on the horizontal plane overlap. There is a through hole on the upper and lower sides of the adjustment part, which is concentric with the guide hole. The support rod passes through the two through holes. The adjustment part and the support rod are rotatably connected. There are openings on both sides of the adjustment part that are not connected to the telescopic drive component. The support rod and the guide hole are concentric. There is a gap between the support rod and the guide hole.

[0010] Furthermore, the section is formed by splicing two centrally symmetrical components, and the through-hole jack can also be hinged to the lower end of the telescopic drive component.

[0011] Furthermore, it also includes templates, and the support frame includes several lifting units. Each lifting unit includes a horizontal bar, two lifting rods, and limiting components. The limiting components include a base plate and a limiting ring. The base plate is connected to the bottom of the support channel steel, and the limiting ring is set between the two support channel steels. The upper end of the limiting ring protrudes relative to the upper surface of the support channel steel. The horizontal bar passes through the two limiting components and is supported on the support channel steel. Both ends of the horizontal bar are connected to the upper ends of the two lifting rods, and the lower ends of the two lifting rods are connected to the template.

[0012] Furthermore, the template includes several outer molds, each with a back rib on its outer side. Each back rib has a diagonal brace at both ends. Between the diagonal braces of adjacent outer molds, there are diagonal braces and two nuts. The two ends of the diagonal braces pass through the two diagonal braces and are threaded to the two nuts. Each side of the outer mold has a reinforcing part with a beveled surface on its inner side and a horizontal connector on its outer side. After adjacent outer molds are vertically spliced, the beveled surfaces of the two reinforcing parts are attached together. The two horizontal connectors are detachably connected. The reinforcing part is a special-shaped tube with a right-angled triangular cross section and a right-angled triangular beveled surface. Several stiffening plates are evenly spaced along the length direction inside the reinforcing part.

[0013] Furthermore, the horizontal connector includes a vertically arranged vertical connecting plate and a horizontally arranged arc-shaped plate. Both ends of the arc-shaped plate are connected to the outer side of the reinforcing part and the side of the vertical connecting plate, respectively. The side of the vertical connecting plate away from the arc-shaped plate is the connection surface of the two horizontal connectors. The connection surface is connected by bolts. The connection surface and the corresponding beveled surface of the reinforcing part are coplanar. A hollow hole is formed between the two arc-shaped plates of the two horizontal connectors. The hollow hole and the beveled surface are in continuous contact.

[0014] This solution also has the following effects: 1. This solution is also applicable to hollow square piers. During the construction of hollow piers, formwork and support are required on the inner side of the pier. Therefore, lifting equipment is needed to transfer materials directly above the pier, which can easily cause collisions with the lifting frame and lead to the lifting frame shifting. The support unit of this solution is a "well" shaped structure, which leaves the central area empty to facilitate the transfer of materials on the inner side of the pier and avoids collisions with the lifting equipment.

[0015] 2. In this scheme, each overlapping area corresponds to two telescopic drive components, so there are a total of eight telescopic drive components. When the lifting frame twists due to factors such as collision, four of the telescopic drive components are driven to extend in a clockwise or counterclockwise direction, and the remaining four telescopic drive components are driven to shorten, thereby driving the lifting frame back to the initial position and ensuring the verticality of the lifting frame.

[0016] 3. In existing technologies, the through-hole jack and the support unit are usually fixedly connected so that the through-hole jack can drive the support unit to move upward. If the existing technology is applied to this solution, when a displacement occurs, the adjustment unit and the support rod will also shift. When adjusting the horizontal displacement of the support unit, the telescopic drive can only adjust the support unit, and the support rod still cannot be adjusted to the initial vertical position. This not only increases the internal force at the connection between the through-hole jack and the support unit, making the structure more prone to deformation, but also causes the support rod to continue to shift when the lifting frame continues to lift, thus causing the support structure to shift along with the support rod.

[0017] In this solution, each lifting point is connected to the support unit via a telescopic drive component. The adjustment section is considered as one node, and the connection points between the two telescopic drive components and the support unit are considered as two nodes. A total of three nodes form a stable plane, stabilizing the structure of each lifting point and replacing the "fixed connection between the through-type jack and the support unit" in the prior art. When the lifting equipment and the support unit collide or the support unit shifts due to other reasons, the external force is transmitted to the adjustment section through the telescopic drive component. The adjustment section protects the support rod inside by absorbing the energy transmitted by the external force through surface concavity. When the external force generates an eccentric force relative to the centroid of the adjustment section, the adjustment section will also absorb energy through torsion. Since the adjustment section is a shell structure and is rotatably connected to the support rod, whether it is concavity or torsion, as long as it is controlled within a certain range, it will hardly be transmitted to the support rod, thereby reducing the impact of the support unit's shift on the support rod.

[0018] 4. When the support unit shifts, since the upper surface of the adjusting part and the lower surface of the supporting channel steel are horizontally slidingly connected, no internal force is generated between the upper surface of the adjusting part and the supporting channel steel, and deformation is not easy to occur. The adjusting part will absorb energy through indentation and torsion. Therefore, the horizontal shift of the support unit is significantly greater than that of the adjusting part. At the same time, the cross-over area of ​​the support unit and the outer contour of the adjusting part are the same. Therefore, the misalignment of the adjusting part and the cross-over area can be clearly observed, thus indicating that the lifting frame has shifted, thereby reminding the workers to correct the deviation in time.

[0019] 5. After multiple adjustments, the deformation and torsional energy absorption effect of the adjustment part is significantly weaker. Disconnect the lower end of the telescopic drive component from the adjustment part, extend the telescopic drive component, hinge the lower end of the telescopic drive component to the lifting jack, continue to extend all telescopic drive components, lift the support unit upward, remove the adjustment part from the through-hole jack, replace it with a new adjustment part, shorten the telescopic drive component, change the support position from the telescopic drive component to the new adjustment part, and re-hing the lower end of the telescopic drive component to the adjustment part. 6. Since the support rod and the guide hole are concentric, when the support unit is offset, the distance between the support rod and the guide hole is no longer uniform. Therefore, the direction of the support unit offset is determined by the minimum position of the gap between the support rod and the guide hole.

[0020] 7. By reinforcing the side of the formwork, the rigidity of the formwork is increased, reducing the deformation of the formwork during construction. This reduces the deviation of the formwork's verticality during construction and prevents the support channel steel from being pulled by the hangers due to the formwork's offset, thus preventing the lifting frame from shifting.

[0021] 8. In the prior art, the template at the corner position is usually equipped with connecting bolts at the inside corner. However, in this solution, in order to reduce the deformation of the template, a reinforcing part is set. It is not possible to set a recessed shape such as inside corner, otherwise the strength of the reinforcing part will be reduced. Therefore, this solution sets a horizontal connector on the outside of the reinforcing part, and realizes the bolt connection of the template at the corner position through the horizontal connector.

[0022] 9. In the prior art, the ends of the template are usually flat, and the bolt holes need to be manually aligned during assembly until the four corners of the rectangular pier template are connected. In this solution, since the ends of the template are beveled, only two opposite templates need to be fixed. The remaining two templates can be aligned with the bolt holes by pushing them inward along the beveled surface, which is convenient and quick and improves construction efficiency.

[0023] 10. With the first-layer outer formwork properly adjusted, the second-layer outer formwork does not require adjustment using a total station. During the bolt tightening process, the horizontal connecting plate drives the two adjacent formwork panels to slide simultaneously along the connecting surface, thus returning the formwork to the designed vertical state. The verticality of the formwork can be guaranteed solely by the vertical and horizontal connecting parts between the formwork panels, thereby greatly accelerating the construction speed of the bridge piers.

[0024] 11. Since the connecting surfaces of the two horizontal connectors and the corresponding oblique surfaces of the reinforcing parts are coplanar, when the ends of the two templates are relatively displaced along the oblique surfaces, the bolts on the connecting surfaces are perpendicular to the direction of movement, thereby maximizing the use of the shear resistance of the bolts to prevent the oblique surfaces from shifting.

[0025] 12. During construction, due to the presence of inclined surfaces, if the formwork cannot guarantee verticality, misalignment will occur at the corners of the rectangular piers, prompting the construction unit to make timely corrections. The construction unit only needs to repair the surface of the pier. However, if it is not repaired in time, and the pier is found to be tilted only after construction is completed, the offset of the lifting frame will also increase during the lifting process, causing greater safety hazards. The entire pier will need to be recast, which will be more costly.

[0026] 13. Since the horizontal connectors are located on the outside of the formwork, the deformation of the formwork caused by uneven stress during demolding has little impact on the horizontal and vertical connectors, and thus has little impact on the verticality of the formwork and lifting frame in subsequent construction.

[0027] 14. In this scheme, during construction, the horizontal connectors mainly serve to ensure verticality, while the main force is borne by the diagonal tie rods. However, after repeated use, the diagonal tie rods will experience fatigue and reduced elasticity. During the casting of rectangular piers, they are more likely to elongate under stress, causing the beveled surfaces of adjacent formwork to not fit tightly together. This results in grout leaking between the beveled surfaces, alerting construction workers to problems with the verticality of the formwork and allowing for timely correction. Since the hollow holes and beveled surfaces are in continuous contact, even if grout leakage occurs during construction, the grout will flow directly through the hollow holes, reducing the probability of it adhering to the horizontal connectors. This prevents the horizontal connectors from deforming after the grout solidifies, thus ensuring the verticality of the formwork and, consequently, the verticality of the lifting frame. Attached Figure Description

[0028] Figure 1 This is a three-dimensional isometric view of Example 1; Figure 2 for Figure 1 Enlarged view of point A; Figure 3 This is a three-dimensional isometric view of Example 1 after the removal of the operating platform; Figure 4 for Figure 3 Enlarged view of point B; Figure 5 This is a top view of the ring beam in Example 1; Figure 6 This is a three-dimensional isometric view of the lifting frame in Example 1; Figure 7 for Figure 6 Enlarged view at point C; Figure 8 This is a front view of the lifting frame in Example 1; Figure 9 This is a top view of the lifting frame in Example 1; Figure 10 for Figure 9 Enlarged view of point D in the image; Figure 11 for Figure 9 Schematic diagram of the overlapping area at point D; Figure 12 This is a partial enlarged view of Example 2; Figure 13 This is a cross-sectional view of the adjustment part in Embodiment 2; Figure 14 This is a three-dimensional isometric view of the template in Example 4; Figure 15 This is a three-dimensional isometric view of the reinforcing part in Example 4; Figure 16 This is a diagram showing the internal structure of the reinforcing section after the oblique cut surface is hidden in Example 4; Figure 17 This is a three-dimensional isometric view of the horizontal connector in Example 4; Figure 18 This is a three-dimensional axonometric drawing of the vertical connector in Example 4; Figure 19 This is a top view of the template for Example 4; Figure 20 for Figure 19 Enlarged view of point E; Figure 21 This is an enlarged view of the corner points when the template is tilted in Example 4; Figure 22 Enlarged view of the corner points of the template in the prior art; Figure 23 A magnified view of the corner points when the template of the prior art is tilted; Figure 24 This is an enlarged view of the template corner, diagonal tie rod, and horizontal connector in Example 4; Figure 25 Enlarged view of the template corner, diagonal tie rod, and horizontal connector in Example 4 when the tie rod is fatigued. Detailed Implementation

[0029] The following detailed description illustrates the specific implementation method: The reference numerals in the accompanying drawings include: 1. Cast-in-place section of pier column; 2. Formwork; 20. Outer formwork; 21. Vertical connector; 211. Horizontal connector; 212. Support plate; 221. Reinforcing part; 222. Beveled surface; 223. Stiffening plate; 23. Back rib; 231. Diagonal tie rod; 232. Nut; 233. Horizontal connector; 241. Vertical connector; 242. Arc plate; 243. Hollow hole; 3. Support unit; 31. Overlapping area; 32. Support channel steel; 33. Strip gap; 34. Reinforcing part. Plate 34, support block 35, screw 36, guide hole 37, support rod 4, through-hole jack 5, adjustment part 6, ear plate 61, telescopic drive component 62, opening window 63, diagonal 64, hoisting unit 7, horizontal bar 71, lifting rod 72, limiting component 73, base plate 74, limiting ring 75, operating platform 8, ring beam 9, frame unit 91, scissor brace 911, vertical rectangular tube 912, bottom support 913, vertical connecting rod 92, vertical rod connector 93, corner connector 94.

[0030] Example 1 Example 1 is basically as follows Figure 1-11 As shown: A prefabricated lifting platform suitable for formwork construction of hollow rectangular bridge piers, including a lifting frame, a ring beam 9 and an operating platform 8.

[0031] The lifting frame includes a template 2, four support units 3, and a lifting unit. For example... Figure 6 , Figure 9As shown, the four support units 3 are all long rods, intersecting perpendicularly in pairs to form a "well" shaped structure. The projection of the intersection of two adjacent support units 3 onto the horizontal plane forms four... Figure 11 The overlapping area 31 shown includes two parallel support channel steels 32 in each support unit 3, as shown. Figure 9 , Figure 10 As shown, a strip-shaped gap 33 is left between the two supporting channel steels 32. A reinforcing plate 34 is provided above the middle of the strip-shaped gap 33 of the two supporting units 3 arranged in the left and right directions. The reinforcing plate 34 is welded to both supporting channel steels 32. Figure 7 , Figure 9 As shown, the strip-shaped gap 33 is further provided with several support blocks 35, screws 36, and connecting nuts. The support blocks 35 are supported between two support channel steels 32 to ensure the width of the strip-shaped gap 33. The screws 36 pass through the support blocks 35 and the two support channel steels 32, and are tightened at both ends by the connecting nuts. Figure 10 As shown, the guide hole 37 is formed at the intersection and overlap of the two strip-shaped slits 33.

[0032] like Figure 9 , Figure 10 As shown, the connection method of the support channel steels 32 of the two support units 3 in the overlapping area 31 is as follows: the support channel steel 32 of one of the support units 3 is the main channel steel, corresponding to... Figure 10 The channel steel is arranged in the upper and lower directions, with the supporting channel steel 32 of another supporting unit 3 as the secondary channel steel, corresponding to... Figure 10 The channel steel is set in the left and right directions, dividing the secondary channel steel into three sections and welding them to the main channel steel, so that the three sections of the secondary channel steel are spliced ​​together on the first straight line.

[0033] Each lifting unit is positioned within its respective overlapping area 31, forming four lifting points. Each lifting unit includes a support rod 4, a through-type jack 5, and two telescopic drive components 62. Figure 8 As shown, the upper side of the through-type jack 5 is bolted with an adjusting part 6, which is supported below the supporting channel steel 32. The lower end of the supporting rod 4 is embedded in the already poured section 1 of the pier column, and the upper end of the supporting rod 4 passes through the through-type jack 5, the adjusting part 6, and the guide hole 37 in sequence. The supporting rod 4 and the guide hole 37 are concentric. Figure 10 As shown, a gap is left between the support rod 4 and the guide hole 37, and the rigidity of the support rod 4 is greater than that of the adjusting part 6. The through-type jack 5 is capable of climbing on the support rod 4, which is existing technology. Figure 6 , Figure 8As shown, the lower ends of the two telescopic drive members 62 are hinged to the adjustment part 6 at the same height. The upper ends of the output shafts of the telescopic drive members 62 are inserted between the two support channel steels 32 of the corresponding support unit 3 and hinged to the two support channel steels 32. In this embodiment, the hinge method is: the pin passes through two or more objects and is rotatably connected to all objects. The setting direction of the two telescopic drive members 62 is the same as the length direction of a support channel steel 32 and is perpendicular to each other. The telescopic drive members 62 are all jacks. The output shafts of the telescopic drive members 62 can extend and shorten.

[0034] The adjusting part 6 is a rectangular shell. The overlapping area 31 and the adjusting part 6 have the same rectangular outer contour. The projections of the overlapping area 31 and the adjusting part 6 on the horizontal plane overlap. The upper surface of the adjusting part 6 and the lower surface of the supporting channel steel 32 of the overlapping area 31 are attached and horizontally slidably connected. The adjusting part 6 has a through hole concentric with the guide hole 37 on its upper and lower sides (not shown in the figure). The support rod 4 passes through the two through holes. The through holes of the adjusting part 6 and the support rod 4 are slidably and rotatably connected. An ear plate 61 is welded on each of the two adjacent sides of the adjusting part 6. The lower ends of the two telescopic drive members 62 are hinged to one of the ear plates 61 respectively. Figure 6 , Figure 8 As shown, the adjustment section 6 without the telescopic drive component 62 has two rectangular opening windows 63 on each of its two sides, so that the operator can observe the interior of the adjustment section 6 through the opening windows 63.

[0035] Figure 3 and Figure 6 In the diagram, the support unit from the upper left to the lower right is the horizontal support unit 3, and the support unit from the upper right to the lower left is the vertical support unit 3.

[0036] It also includes two lifting units 7, each of which includes a horizontal bar 71, two lifting rods 72, and a limiting member 73, such as Figure 6 , Figure 9 As shown, the limiting component 73 includes a base plate 74 and a limiting ring 75. The base plate 74 is welded to the bottom of the support channel steel 32 of the longitudinal support unit 3. The limiting ring 75 is disposed between the two support channel steels 32, and the lower end of the limiting ring 75 is welded to the base plate 74. Figure 7 As shown, the upper end of the limiting ring 75 protrudes relative to the upper surface of the supporting channel steel 32, as... Figure 9 As shown, the horizontal bar 71 is set in the left and right directions, that is, and Figure 6 The horizontal support unit 3 is parallel to the horizontal bar 71, which passes through two limiting members 73 and is supported on the support channel steel 32. The two ends of the horizontal bar 71 are welded to the upper ends of the two hanging rods 72 respectively, and the lower ends of the two hanging rods 72 are bolted to the template 2.

[0037] like Figure 3As shown, a frame unit 91 is vertically provided at each end of the longitudinal support unit 3. The frame unit 91 includes two vertical rectangular tubes 912 and two bottom support tubes 913. The two bottom support tubes 913 are arranged in parallel and cooperate to clamp and bolt the lower ends of the two vertical rectangular tubes 912. The upper ends of the vertical rectangular tubes 912 are bolted between the two support channel steels 32 of the longitudinal support unit 3. A scissor brace 911 is provided between the upper parts of the two vertical rectangular tubes 912. The scissor brace 911 consists of two intersecting rectangular tubes. The ends of the two rectangular tubes are bolted to the vertical rectangular tubes 912.

[0038] like Figure 1 As shown, the ring beam 9 passes through the lower part of the frame unit 91. The ring beam 9 includes several standard truss units, which are divided into three levels according to their length. The length difference between two adjacent levels of standard truss units is equal and 1 meter, that is, the lengths of the standard truss units at each level are 1 meter, 2 meters, and 3 meters, respectively. Adjacent standard truss units are connected by bolts. Specifically, rectangular node plates are welded at the connection points of adjacent standard truss units, and four corner bolts are driven into the four corners of the node plates to achieve the connection. Then, all the standard truss units are arranged in a circle to form a ring. Figure 5 The ring beam 9 shown has steel plates screwed onto it for people to stand on, as shown. Figure 3 As shown, the left side of the ring beam 9 consists of a 1-meter standard truss unit and three 3-meter standard truss units, while the right side of the ring beam 9 consists of a 2-meter standard truss unit and three 3-meter standard truss units. The outer side of the ring beam 9 is welded to the operating platform 8, and the operating platform 8 is fixedly connected to the frame unit 91. Figure 3 , Figure 4 As shown, a corner connector 94 is also provided at the corner of the ring beam 9. The corner connector 94 is "U"-shaped, and the opening of the corner connector 94 faces horizontally. The corner connector 94 is bolted to a standard truss unit at the corner position, and the two are fitted together on a rectangular tube of another standard truss unit. Figure 4 Arrows are used to indicate the length direction of the two standard truss elements at the corner position.

[0039] The operating platform 8 includes vertical connecting rods 92 and three-layer platforms. One layer of platforms is installed on the ring beam 9, and the remaining platforms are installed below the ring beam 9 and connected to the ring beam 9 via the vertical connecting rods 92. Vertical connecting rods 92 and the ring beam 9 are connected by vertical connecting rods 93. Both the vertical connecting rods 92 and the standard truss units are composed of rectangular tubes. Figure 1 , Figure 2 As shown, the vertical rod connector 93 is an inverted U-shape with the opening facing downwards. The upper ends of the vertical rod connector 93 and the vertical connecting rod 92 are bolted together, and the two are fitted onto the rectangular tube of a standard truss unit.

[0040] The following is a method for using a prefabricated lifting platform: 1. This scheme is applicable to the slipform construction of rectangular piers. Lifting units, support units 3, frame units 91, and standard truss units of varying lengths are prefabricated in the factory and transported to the site for assembly according to the actual conditions and pier dimensions. When pouring the first formwork of the pier, the lower end of the lifting unit is pre-embedded within the already poured section of the pier. The lifting unit, support unit 3, and frame unit 91 are connected. The assembled standard truss unit is passed through frame unit 91, and then all standard truss units are spliced ​​together to form a ring beam 9.

[0041] This solution is also applicable to hollow square piers. During the construction of hollow piers, formwork and support are required on the inner side of the pier. Therefore, lifting equipment is needed to transfer materials directly above the pier, which can easily cause collisions with the lifting frame and lead to the lifting frame shifting. In contrast, the support unit 3 in this solution is a "well" shaped structure, which leaves the central area empty to facilitate the transfer of materials on the inner side of the pier and avoids collisions with the lifting equipment. 2. Based on the length direction of the two adjacent support units 3, the horizontal offset of each lifting point can be divided into two horizontal displacements. The horizontal component of the telescopic thrust of the telescopic drive 62 can correct the horizontal displacements in these two directions, thereby accurately adjusting the lifting frame to the initial state. In this scheme, returning to the initial state means that the projection of the object on the horizontal plane is consistent with the initial projection. Since the telescopic drive 62 in the two directions is perpendicular to each other, the mutual influence during adjustment is small, thus greatly reducing the complexity of adjusting the horizontal displacement.

[0042] 3. Each overlapping area 31 corresponds to two telescopic actuators 62, therefore there are a total of eight telescopic actuators 62, such as... Figure 8 As shown, the eight telescopic drive components 62 are numbered ①-⑧. When the lifting frame twists due to factors such as collision, taking clockwise twist as an example, the operator drives four of the odd-numbered telescopic drive components 62 to extend in the counterclockwise direction, that is, drives the even-numbered telescopic drive components 62 to extend, and drives the remaining four odd-numbered telescopic drive components 62 to shorten, thereby driving the lifting frame back to the initial position and ensuring the verticality of the lifting frame.

[0043] 4. In the prior art, the through-hole jack 5 and the support unit 3 are usually fixedly connected so that the through-hole jack 5 can drive the support unit 3 to move upward. If the prior art is applied to this solution, when the offset occurs, the adjustment unit and the support rod 4 will offset together. When adjusting the horizontal displacement of the support unit 3, the telescopic drive component 62 can only adjust the support unit 3, and the support rod 4 still cannot be adjusted to the initial vertical position. This not only increases the internal force at the connection between the through-hole jack 5 and the support unit 3, making the structure more prone to deformation, but also causes the support rod 4 to continue to offset when the lifting frame continues to lift, which in turn causes the support structure to offset along with the support rod 4.

[0044] In this solution, each lifting point is connected to the support unit 3 via a telescopic drive component 62. The adjustment part 6 is considered as a node, and the connection points between the two telescopic drive components 62 and the support unit 3 are considered as two nodes. A total of three nodes form a stable plane, stabilizing the structure of each lifting point, thus replacing the "fixed connection between the through-type jack 5 and the support unit 3" in the prior art. When the lifting equipment collides with the support unit 3 or the support unit 3 shifts due to other reasons, the external force is transmitted to the adjustment part 6 through the telescopic drive component 62. The adjustment part 6 protects the support rod 4 inside by absorbing the energy transmitted by the external force through surface concavity. When the external force generates an eccentric force relative to the centroid of the adjustment part 6, the adjustment part 6 will also absorb energy through torsion. Since the adjustment part 6 is a shell structure and is rotatably connected to the support rod 4, whether it is concavity or torsion, as long as it is controlled within a certain range, it will hardly be transmitted to the support rod 4, thereby reducing the impact of the shift of the support unit 3 on the support rod 4.

[0045] 5. When the support unit 3 shifts, since the upper surface of the adjustment part 6 and the lower surface of the support channel steel 32 are horizontally slidingly connected, no internal force is generated between the upper surface of the adjustment part 6 and the support channel steel 32, and deformation is not easy to occur. The adjustment part 6 will absorb energy through indentation and torsion. Therefore, the horizontal shift of the support unit 3 is significantly greater than that of the adjustment part 6. At the same time, the cross-overlapping area 31 of the support unit 3 and the outer contour of the cross section of the adjustment part 6 are the same. Therefore, the misalignment of the adjustment part 6 and the cross-overlapping area 31 can be clearly observed, thereby determining that the lifting frame has shifted, thus reminding the workers to correct the deviation in time.

[0046] 6. Since the support rod 4 and the guide hole 37 are concentric, when the support unit 3 is offset, the distance between the support rod 4 and the guide hole 37 is no longer uniform. Therefore, the direction of the offset of the support unit 3 is determined by the minimum position of the gap between the support rod 4 and the guide hole 37.

[0047] Example 2 like Figure 12 , Figure 13 As shown, Example 2 is based on Example 1: Figure 13 As shown, the adjustment part 6 is formed by splicing two components arranged in the center. Each component includes two adjacent sides of the adjustment part 6, half of the upper surface separated from the diagonal 64 and half of the lower surface separated from the diagonal 64. The two components are detachably connected by bolts.

[0048] like Figure 12 As shown, the through-hole jack 5 is also bolted to a lug plate 61, which can also be hinged to the lower end of the telescopic drive component 62.

[0049] The following is a method for using a vertically controllable lifting frame: After multiple adjustments, the deformation and torsional energy absorption effect of the adjusting part 6 is significantly weaker. Disconnect the lower end of the telescopic drive member 62 from the adjusting part 6, extend the telescopic drive member 62, hinge the lower end of the telescopic drive member 62 to the lifting jack, continue to extend all the telescopic drive members 62, lift the support unit 3 upward, remove the adjusting part 6 from the through-hole jack 5, replace it with a new adjusting part 6, shorten the telescopic drive member 62, change the support position from the telescopic drive member 62 to the new adjusting part 6, and re-hing the lower end of the telescopic drive member 62 to the adjusting part 6.

[0050] Example 3 In Example 3, based on Example 1, an electrically connected tilt sensor and alarm are installed in the adjustment unit 6. When the tilt sensor detects that the tilt of the adjustment unit 6 exceeds the design value, the alarm will sound.

[0051] Example 4 Example 4 is basically as follows Figures 14-25 As shown, based on Embodiment 1: Template 2 includes several inner molds and four outer molds 20. The four outer molds 20 surround the outside of the rectangular pier column. Several back ribs 23 surround the outside of the outer molds 20. The ends of the back ribs 23 are all provided with inclined bracing 231, such as... Figure 17 As shown, a tie rod 232 and a nut 233 are provided between adjacent tie seats 231. The tie rod 232 passes through the tie seat 231 and is threadedly connected to the nut 233, thereby connecting the tie rod 232 to the adjacent back rib 23.

[0052] like Figure 15 and Figure 16 As shown, the right side of the outer mold 20 is the inner side. Each outer mold 20 has a reinforcing part 221 integrally formed on its left and right sides. The reinforcing part 221 is a vertically arranged isosceles right-angled triangular cross-section irregular tube. The inclined surface of the right-angled triangle forms a beveled surface 222, which is set on the inner side of the reinforcing part 221. After the sides of adjacent outer molds 20 are vertically spliced, the beveled surfaces 222 of the two reinforcing parts 221 are attached together. The inclination angle of the beveled surface 222 is 45°. The beveled surface 222 is perpendicular to the inclined tie rod 232, so that the beveled surfaces 222 are more tightly joined by the inclined tie rod 232. At the same time, the inclined tie rod 232 does not generate a component force parallel to the beveled surface 222, thereby avoiding relative sliding of the two beveled surfaces 222. Figure 16 As shown in the figure, the reinforcing part 221 is provided with several stiffening plates 223 at equal intervals along its length. In this embodiment, the inner side is the side close to the cast-in-place section 1 of the pier column, and the outer side is the side away from the cast-in-place section 1 of the pier column.

[0053] like Figure 17As shown, a horizontal connector 24 is welded to the outside of the reinforcing part 221. The horizontal connector 24 includes a vertically arranged vertical connecting plate 241 and three horizontally arranged arc-shaped plates 242. Both ends of the arc-shaped plates 242 are welded to the outside of the reinforcing part 221 and the side of the vertical connecting plate 241, respectively. The side of the vertical connecting plate 241 away from the arc-shaped plates 242 is the connection surface of the two horizontal connectors 24. The connection surface of the two horizontal connectors 24 is coplanar with the beveled surface 222 of the corresponding reinforcing part 221. After the sides of adjacent outer molds 20 are vertically spliced, the connection surfaces of the two horizontal connectors 24 are aligned and connected by bolts. A hollow hole 243 is formed in the middle of the two arc-shaped plates 42 of the two horizontal connectors 24. The hollow hole 243 is in continuous contact with the beveled surface 22.

[0054] like Figure 18 As shown, two vertical connecting parts 21 are welded to the upper and lower sides of the outer mold 20 respectively. The vertical connecting parts 21 include a horizontal connecting plate 211 and several vertically arranged triangular support plates 212. The support plates 212 are welded to the outer side of the outer mold 20 and the side of the horizontal connecting plate 211 respectively. When the upper and lower outer molds 20 are spliced, they are aligned and the horizontal connecting plates 211 of the upper and lower outer molds 20 are connected by bolts.

[0055] The method for ensuring the verticality of the lifting frame using template 2 is as follows: 1. This embodiment is applicable to slipform construction. By strengthening the rigidity of the side of the outer mold 20 through the reinforcing part 221, the deformation of the outer mold 20 during construction is reduced. Therefore, as long as the outer mold 20 of the first layer is vertical, as long as the adjacent outer molds 20 of the second layer are connected by the horizontal connector 24, the verticality of the outer mold 20 can be automatically calibrated, thereby reducing the deviation of the verticality of the outer mold 20 during construction, and thus reducing the amount of measurement and positioning work.

[0056] 2. Since the end of the outer mold 20 is a beveled surface 222, only two opposite outer molds 20 need to be fixed. The remaining two outer molds 20 can be aligned with the bolt holes by simply pushing them inward along the beveled surface 222. This is convenient, quick, and improves construction efficiency.

[0057] 3. With the first-layer outer formwork 20 properly adjusted, the second-layer outer formwork 20 does not require adjustment using a total station. During the bolt tightening process, the vertical connecting plate 241 and the horizontal connecting plate 211 cause the two adjacent outer formworks 20 to slide simultaneously along the connecting surface, thereby returning the outer formwork 20 to the designed vertical state. The verticality of the outer formwork 20 can be guaranteed solely by the vertical connecting piece 21 and the horizontal connecting piece 24 between the outer formworks 20, thus greatly accelerating the construction speed of the bridge piers.

[0058] 4. Since the connecting surfaces of the two horizontal connectors 24 and the oblique cut surfaces 222 of the corresponding reinforcing parts 221 are coplanar, when the ends of the two outer molds 20 are displaced relative to each other along the oblique cut surfaces 222, the bolts on the connecting surfaces are perpendicular to the direction of movement, thereby maximizing the use of the shear resistance of the bolts to prevent the oblique cut surfaces 222 from shifting.

[0059] 5. During the lifting process, due to the inclined surface 222, if the lifting frame shifts and causes the outer formwork 20 to tilt, a misalignment will occur at the corner of the rectangular pier. This will remind the construction unit to adjust the shift of the lifting frame in time. The construction unit only needs to repair the surface of the already poured pier column. However, if it is not repaired in time, and the tilt of the pier column is only discovered after the construction is completed, it will cause greater safety hazards and require the entire pier to be re-poured, which will be more costly.

[0060] 6. Since the horizontal connector 24 and the vertical connector 21 are located on the outside of the outer mold 20, the deformation of the outer mold 20 caused by uneven force during demolding has little impact on the horizontal connector 24 and the vertical connector 21, and thus has little impact on the verticality of the outer mold 20 in subsequent construction.

[0061] 7. During construction, the horizontal connector 24 and the vertical connector 21 mainly serve to ensure the verticality of the interior of the formwork 2. The main force is borne by the inclined surface 222. Under normal circumstances, the corner points of the outer formwork 20 are as follows: Figure 24 As shown, however, after repeated use, the oblique surface 222 of the outer mold 20 will experience fatigue and reduced elasticity, making it more prone to elongation under stress during the casting of rectangular bridge piers, and then... Figure 25 As shown, the oblique cut surfaces 222 of adjacent outer molds 20 cannot fit tightly together, causing grout to leak out between the oblique cut surfaces 222. This alerts the construction personnel that there is a problem with the verticality of the outer mold 20 and allows for timely correction. Since the hollow hole 243 and the oblique cut surface 222 are in continuous contact, even if grout leakage occurs during construction, the grout will leak out directly through the hollow hole 243, and the probability of it adhering to the horizontal connector 24 is small. This prevents the horizontal connector 24 from deforming together after the grout solidifies, thus ensuring the verticality of the outer mold 20.

[0062] 8. When the lifting frame shifts in a certain direction, it will pull the outer mold 20 through the suspension rod 72, causing the outer mold 20 to... Figure 25 As shown, the oblique cut surfaces 222 of adjacent outer molds 20 cannot fit tightly together. Similarly to the previous step, the grout leaks out between the oblique cut surfaces 222, thus reminding the construction personnel that the lifting frame is shifting in a certain direction, and thus correcting the deviation in time.

[0063] 9. After multiple lifting operations, and after pouring the bridge pier and removing the outer formwork 20, check whether there is misalignment at the corners of the poured section 1 of the pier column; if the verticality accuracy of the outer formwork 20 is sufficient, then the outer formwork 20 is as follows: Figure 19 and Figure 20 As shown; if the perpendicularity accuracy of the outer mold 20 is insufficient, then the outer mold 20 will be as follows: Figure 21 As shown, misalignment can easily occur. However, in existing technologies, if the perpendicularity accuracy of the outer mold 20 is sufficient, the outer mold 20 will... Figure 22 As shown; if the perpendicularity accuracy of the outer mold 20 is insufficient, then the outer mold 20 will be as follows: Figure 23 As shown, the outer mold 20 is not prone to misalignment, and therefore it is not easy to observe the tilt of the outer mold 20 with the naked eye. The above descriptions are merely embodiments of the present invention, and common knowledge such as specific technical solutions and / or characteristics are not described in detail here. It should be noted that those skilled in the art can make various modifications and improvements without departing from the technical solutions of the present invention, and these should also be considered within the scope of protection of the present invention. These modifications and improvements will not affect the effectiveness of the implementation of the present invention or the practicality of the patent. The scope of protection claimed in this application should be determined by the content of its claims, and the specific embodiments described in the specification can be used to interpret the content of the claims.

Claims

1. A prefabricated lifting platform, characterized in that: The structure includes a lifting frame, a ring beam, and an operating platform connected in sequence. The lifting frame consists of several lifting units and horizontally arranged elongated support units. The lower end of the lifting unit is embedded in the cast-in-place section of the pier. The lifting unit and the support unit are connected. The end of the support unit is provided with a vertically arranged frame unit. The upper part of the frame unit is provided with scissor bracing. The ring beam passes through the lower part of the frame unit. The ring beam consists of several standard truss units. The standard truss units are divided into several levels according to their length. The length difference between two adjacent levels of standard truss units is equal. Adjacent standard truss units can be detached and connected to form a ring. The outer side of the ring beam is connected to the operating platform. The operating platform and the frame unit are fixedly connected. The operating platform also includes vertical connecting rods and vertical rod connectors. Both the vertical connecting rods and standard truss units are composed of rectangular tubes. The vertical rod connectors are inverted U-shaped with their openings facing downwards. The upper ends of the vertical rod connectors and vertical connecting rods are bolted together, and the two are fitted onto the rectangular tube of a standard truss unit. The ring beam also includes corner connectors. The corner connectors are "U"-shaped, with their openings facing horizontally. The corner connectors are bolted together with a standard truss unit at a corner position, and the two are fitted onto a rectangular tube of another standard truss unit. The support units are arranged in a grid pattern by perpendicularly intersecting each other, forming four overlapping areas. Each overlapping area has a vertical guide hole. Each lifting unit includes a support rod, a through-hole jack, and several telescopic drive components. The through-hole jack has an adjustment part, which is supported below the support unit. The lower end of the support rod is embedded in the cast-in-place section of the pier column. The upper end of the support rod passes through the through-hole jack, the adjustment part, and the guide hole in sequence. The lower end of the telescopic drive component is hinged to the adjustment part, and the upper end of the output shaft of the telescopic drive component is hinged to the support unit. Each adjustment part and the lower ends of two telescopic drive components are hinged at the same height. The two telescopic drive components are set along the length of the corresponding support unit and are perpendicular to each other. The upper surface of the adjustment unit and the lower surface of the support unit are horizontally slidably connected. The adjustment unit is a rectangular shell. The overlapping area and the outer contour of the adjustment unit's cross section are the same. The overlapping area and the projection of the adjustment unit on the horizontal plane overlap. There is a through hole on the upper and lower sides of the adjustment unit that is concentric with the guide hole. The support rod passes through the two through holes. The adjustment unit and the support rod are rotatably connected. There are openings on both sides of the adjustment unit that are not connected to the telescopic drive component. The support rod and the guide hole are concentric. There is a gap between the support rod and the guide hole.

2. The prefabricated lifting platform according to claim 1, characterized in that: The adjustment section is formed by splicing two centrally symmetrical components, and the through-hole jack can also be hinged to the lower end of the telescopic drive component.

3. The prefabricated lifting platform according to claim 2, characterized in that: It also includes templates, and the support frame includes several lifting units. Each lifting unit includes a horizontal bar, two lifting rods, and a limiting component. The limiting component includes a base plate and a limiting ring. The base plate is connected to the bottom of the support channel steel, and the limiting ring is set between the two support channel steels. The upper end of the limiting ring protrudes relative to the upper surface of the support channel steel. The horizontal bar passes through the two limiting components and is supported on the support channel steel. The two ends of the horizontal bar are respectively connected to the upper ends of the two lifting rods, and the lower ends of the two lifting rods are connected to the template.

4. The prefabricated lifting platform according to claim 3, characterized in that: The template includes several outer molds, each with a back rib on its outer side. Each back rib has a diagonal brace at both ends. Between the diagonal braces of adjacent outer molds, there are diagonal braces and two nuts. The two ends of the diagonal braces pass through the two diagonal braces and are threaded to the two nuts. Each outer mold has a reinforcing section on its side. The inner side of the reinforcing section has a beveled surface, and the outer side of the reinforcing section has a horizontal connector. After adjacent outer molds are vertically spliced, the beveled surfaces of the two reinforcing sections are attached together. The two horizontal connectors are detachably connected. The reinforcing section is a special-shaped tube with a right-angled triangular cross section and a right-angled triangular beveled surface. Several stiffening plates are evenly spaced along the length of the reinforcing section.

5. The prefabricated lifting platform according to claim 4, characterized in that: The horizontal connector includes a vertically arranged vertical connecting plate and a horizontally arranged arc plate. Both ends of the arc plate are connected to the outer side of the reinforcing part and the side of the vertical connecting plate, respectively. The side of the vertical connecting plate away from the arc plate is the connection surface of the two horizontal connectors. The connection surface is connected by bolts. The connection surface and the corresponding bevel surface of the reinforcing part are coplanar. A hollow hole is formed between the two arc plates of the two horizontal connectors. The hollow hole and the bevel surface are in continuous contact.

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