A method for hoisting and flipping UHPC arch ribs

Abstract

The present invention provides a method for hoisting and flipping UHPC arch ribs, comprising the following steps: equipment preparation, installation of the bottom steel member, installation of the top steel member, connection of the bottom steel member and the top steel member, arrangement of lifting ropes, and hoisting and flipping the UHPC arch ribs. The present invention effectively protects the UHPC arch ribs from damage, preventing common problems such as chipping and cracking during the hoisting and flipping processes.

Description

Technical field

[0001] The present invention relates to the technical field of bridge construction, and in particular to a method for hoisting and flipping a UHPC arch rib. [Background Technology]

[0002] Ultra-High Performance Concrete (UHPC) is considered the most advanced cement-based civil engineering material today, boasting advantages such as high strength, high ductility, high durability, and environmental friendliness. UHPC arch bridges are rare worldwide, and their spans are relatively small. Currently, UHPC is only used in small and medium-span bridges, and only three UHPC arch bridges have been built or are under construction worldwide. Compared to conventional concrete or high-strength concrete, UHPC is relatively expensive per unit, especially when infused with steel fibers, which requires a significant initial investment. However, in actual construction, the use of UHPC not only reduces the concrete weight of components by nearly half and improves structural performance, but also reduces the amount of reinforcement in structural components, even eliminating it entirely. Compared to steel structures with the same load-bearing capacity, UHPC structures are also relatively inexpensive. Due to UHPC's excellent durability and extended service life, its price is acceptable from a lifecycle cost perspective. Currently, UHPC concrete is used in most retrofits of older concrete arch bridges in my country, primarily for casting arch ribs. Due to the excellent performance of UHPC itself, the load-bearing structure of small-span arch bridges can be optimized. For example, ordinary concrete requires eight arch ribs, while UHPC can reduce this to three. At the same time, the cross-section of the arch ribs can also be optimized, such as reducing the cross-sectional area, thereby reducing the deadweight of the concrete arch ribs and facilitating construction.

[0003] When prefabricating UHPC arch ribs, they are prefabricated lying on their side. To meet welding position or transportation requirements, the cast UHPC arch ribs need to be flipped. However, due to the high performance of UHPC arch ribs, most small-span arch bridge designs use UHPC arch ribs, whose arch rib cross-sections are characterized by no reinforcement, thin wall thickness, and variable cross-section. It is not suitable to embed lifting lugs in the structure as in the prior art for flipping steel arch ribs. Furthermore, due to the thin wall thickness of the structure, conventional lifting and flipping methods can easily damage the side walls. Therefore, the main problem to be solved is how to ensure that the UHPC arch ribs are not damaged during the flipping process. [Summary of the invention]

[0004] The present invention aims to solve at least one of the above-mentioned technical problems and provide a method for hoisting and flipping UHPC arch ribs, which can effectively protect the UHPC arch ribs from damage and prevent common problems such as corner chipping and cracking during the hoisting and flipping processes.

[0005] In order to achieve the above object, the technical solution adopted by the present invention is:

[0006] A method for hoisting and flipping a UHPC arch rib comprises the following steps:

[0007] Equipment preparation: prepare two hoisting tools and two cranes for hoisting and flipping UHPC arch ribs according to the number of hoisting holes. The hoisting tools for hoisting and flipping UHPC arch ribs include bottom steel members and upper steel members. The bottom steel members include fixed vertical steel and bottom horizontal steel, and the fixed vertical steel is connected to the bottom horizontal steel; the upper steel members include upper pressure horizontal steel and side pressure vertical steel, and the upper pressure horizontal steel is connected to the side pressure vertical steel. The upper pressure horizontal steel has a hole on its end away from the side pressure vertical steel, which is opposite to the fixed vertical steel. The slot adapted to one end of the bottom horizontal steel is provided, and the end of the upper pressure horizontal steel away from the side pressure vertical steel is detachably connected to the end of the fixed vertical steel away from the bottom horizontal steel; an avoidance hole adapted to the end of the bottom horizontal steel away from the fixed vertical steel is provided through the end of the side pressure vertical steel away from the upper pressure horizontal steel, and the end of the side pressure vertical steel away from the upper pressure horizontal steel is detachably connected to the end of the bottom horizontal steel away from the fixed vertical steel; a top lifting lug is provided on the upper pressure horizontal steel, and a side lifting lug is provided on the side pressure vertical steel;

[0008] Install the bottom side steel member: contact the bottom horizontal steel with the first side surface and contact the fixed vertical steel with the bottom surface;

[0009] Install the upper steel member: move the slot of the upper pressure horizontal steel toward the end of the fixed vertical steel away from the bottom horizontal steel, insert the fixed vertical steel into the slot, and allow the end of the bottom horizontal steel away from the fixed vertical steel to pass through the avoidance hole, so that the side pressure vertical steel contacts the top surface of the UHPC arch rib and the upper pressure horizontal steel contacts the second side surface of the UHPC arch rib;

[0010] Connect the bottom steel member with the upper steel member: when the fixed vertical steel is located at the bottom of the slot, connect the upper pressure horizontal steel with the fixed vertical steel; connect the bottom horizontal steel with the side pressure vertical steel;

[0011] Arrangement of lifting ropes: The two cranes are arranged at opposite sides of the arch rib pedestal, with the lifting rope of one crane connected to the top lifting lug, and the lifting rope of the other crane connected to the side lifting lug;

[0012] Lifting and flipping the UHPC arch rib: The crane connected to the top lifting lug lifts the UHPC arch rib. When the UHPC arch rib is lifted to a preset height, the crane connected to the side lifting lug lifts the UHPC arch rib in a direction perpendicular to the arch rib pedestal, and the UHPC arch rib is gradually flipped. When the bottom surface is opposite to the top surface of the arch rib pedestal and the first side surface and the second side surface are both perpendicular to the top surface of the arch rib pedestal, the flipping operation of the UHPC arch rib is completed.

[0013] Furthermore, the fixed vertical steel and the bottom horizontal steel are provided with a fixed anti-scratch layer on the inner wall facing the upper steel member; the upper pressure horizontal steel and the side pressure vertical steel are both provided with a removable inner anti-scratch part, and the inner anti-scratch part is provided with an anti-scratch layer on the side facing the bottom steel member.

[0014] Furthermore, the inner anti-scratch part includes a limiting bolt part and a pressure steel plate, the limiting bolt part is detachably connected to the upper pressure horizontal steel or the side pressure vertical steel, and one side of the pressure steel plate is connected to the limiting bolt part; the anti-scratch layer is arranged on the side of the pressure steel plate away from the limiting bolt part.

[0015] Furthermore, an adjustment hole is provided on the upper pressure horizontal steel or the side pressure vertical steel; the limiting bolt member includes a limiting screw and two limiting nuts, the limiting screw is arranged to pass through the adjustment hole, and the two limiting nuts are screwed on the limiting screw and are located on opposite sides of the adjustment hole; one side of the pressing steel plate is connected to an end of the limiting screw facing the bottom steel member;

[0016] After the step of "connecting the bottom steel member and the upper steel member", the step of "adjusting the position of the inner anti-scratch member" is included: screwing the two limit nuts to the opposite ends of the corresponding limit screws, moving the limit screws toward the UHPC arch rib, and stopping when the anti-scratch layer connected to the upper pressure horizontal steel abuts against the second side surface and the anti-scratch layer connected to the side pressure vertical steel abuts against the top surface; tightening the two limit nuts toward the adjustment hole until the two limit nuts abut against the corresponding steel.

[0017] Furthermore, the anti-scratch layer includes a foam liner and a rubber sleeve, the foam liner is sleeved on the side of the pressing steel plate away from the limiting screw, and the rubber sleeve is covered on the outside of the foam liner.

[0018] Furthermore, a transverse connecting hole is provided at the end of the fixed vertical steel away from the bottom transverse steel, and matching holes are provided on both sides of the upper pressure transverse steel corresponding to the slot, a screw rod passes through the transverse connecting hole and the matching hole in sequence, and two nuts are screwed into the screw rod to resist the upper pressure transverse steel; vertical connecting holes are provided on the opposite sides of the end of the bottom transverse steel away from the fixed vertical steel, another screw rod passes through the vertical connecting holes on the opposite sides of the bottom transverse steel in sequence, and another two nuts are screwed into the screw rod to resist the bottom transverse steel.

[0019] Furthermore, the connection between the fixed vertical steel and the bottom horizontal steel is reinforced with a steel plate; and a reinforcing plate is provided on the bottom horizontal steel.

[0020] Due to the adoption of the above technical solution, the present invention has the following beneficial effects:

[0021] 1. The use of lifting equipment for UHPC arch rib hoisting and flipping, combined with the flipping of UHPC arch ribs, can effectively protect the UHPC arch ribs from damage and prevent common problems such as corner collapse and cracking during the hoisting and flipping process.

[0022] 2. The lifting device used for hoisting and flipping UHPC arch ribs not only assists in flipping the UHPC arch ribs, but also improves the limiting measures for the UHPC arch ribs. Specifically, since the main force of the lifting device is to fix the vertical steel and the bottom horizontal steel, and the inner anti-scratch parts mainly play a limiting role, it can not only prevent the UHPC arch ribs from being damaged by collisions due to steel connections during the flipping process, but also prevent the UHPC arch ribs from rotating or flipping without restraint during the lifting and flipping process.

Brief Description of the Drawings

[0023] Figure 1 This is a schematic diagram of the structure of the lifting device used for lifting and flipping the UHPC arch rib in the present invention.

[0024] Figure 2 Schematic diagram of the splitting of the bottom steel components and the upper steel components.

[0025] Figure 3 Schematic diagram of the partially disassembled structure of the upper steel components.

[0026] Figure 4 Schematic diagram of the installation steps of the lifting device used for lifting and flipping UHPC arch ribs on UHPC arch ribs.

[0027] Figure 5 A diagram showing the steps for the hoisting and flipping method of UHPC arch ribs.

[0028] In the attached drawings, 1-bottom side steel member, 11-fixed vertical steel, 110-horizontal connection hole, 12-bottom horizontal steel, 120-vertical connection hole, 13-fixed anti-scratch layer, 14-steel plate, 15-reinforcement plate, 16-screw, 17-nut, 2-upper side steel member, 21-upper pressure horizontal steel, 210-slot, 211-matching hole, 22-side pressure vertical steel, 220-avoidance hole, 221-adjustment hole, 23-inner anti-scratch part, 23 1-limiting bolt, 232-limiting screw, 233-limiting nut, 234-pressure steel plate, 24-anti-scratch layer, 242-rubber sleeve, 31-top lifting ear, 32-side lifting ear, 100-UHPC arch rib, 101-first side, 102-second side, 103-bottom surface, 104-top surface, 200-arch rib base, 201-lifting hole, 202-crane, 223-lifting rope, 222-hook. [Specific implementation method]

[0029] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0030] It should be noted that when a component is referred to as being "fixed to" another component, it may be directly on the other component or there may be a central component. When a component is referred to as being "disposed on" another component, it may be directly on the other component or there may be a central component. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only.

[0031] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this invention pertains. The terms used in this specification of the present invention are for the purpose of describing specific embodiments only and are not intended to limit the present invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0032] like Figures 1 to 4 As shown, a preferred embodiment of the present invention provides a hoist for hoisting and flipping UHPC arch ribs, which is used to hoist the UHPC arch ribs during the hoisting and flipping process. Figure 4 The UHPC arch rib includes a first side surface 101, a second side surface 102, a bottom surface 103, and a top surface 104. The first side surface 101 and the second side surface 102 are arranged parallel to each other. The two opposite sides of the bottom surface 103 connect the sides of the first side surface 101 and the second side surface 102 on the same side. The top surface 104 is opposite the bottom surface 103, and the two opposite sides of the top surface 104 connect the sides of the first side surface 101 and the second side surface 102 on the other side. After the UHPC arch rib is prefabricated, its first side surface 101 contacts the top surface of the arch rib base 200, and the bottom surface 103 is perpendicular to the top surface of the arch rib base 200.

[0033] The lifting device used for lifting and flipping the UHPC arch rib includes a bottom steel member 1 and an upper steel member 2. The bottom steel member 1 includes a fixed vertical steel 11 and a bottom horizontal steel 12. Both the fixed vertical steel 11 and the bottom horizontal steel 12 are I-beams. One end of the fixed vertical steel 11 is connected to one end of the bottom horizontal steel 12 and is perpendicular to each other. The upper steel member 2 includes an upper pressure horizontal steel 21 and a side pressure vertical steel 22. Both the upper pressure horizontal steel 21 and the side pressure vertical steel 22 are channel steels. One end of the upper pressure horizontal steel 21 is connected to one end of the side pressure vertical steel 22 and is perpendicular to each other. The end of the upper pressure horizontal steel 21 away from the side pressure vertical steel 22 is provided with a slot 210 adapted to the end of the fixed vertical steel 11 away from the bottom horizontal steel 12. The end of the upper pressure horizontal steel 21 away from the side pressure vertical steel 22 is detachably connected to the end of the fixed vertical steel 11 away from the bottom horizontal steel 12. The side pressure vertical steel 22 has an end facing away from the upper pressure horizontal steel 21 through which a avoidance hole 220 is provided, which is adapted to the end of the bottom horizontal steel 12 facing away from the fixed vertical steel 11. The end of the side pressure vertical steel 22 facing away from the upper pressure horizontal steel 21 is detachably connected to the end of the bottom horizontal steel 12 facing away from the fixed vertical steel 11. The slot 210 and the avoidance hole 220 are cut at the construction site according to the shape of the fixed vertical steel 11 and the bottom horizontal steel 12. The upper pressure horizontal steel 21 is provided with a top lifting lug 31, and the side pressure vertical steel 22 is provided with a side lifting lug 32. Specifically, there are two top lifting lugs 31, which are spaced apart along the length direction of the upper pressure horizontal steel 21, and the top lifting lug 31 is perpendicular to the upper pressure horizontal steel 21; there are two side lifting lugs 32, which are spaced apart along the length direction of the side pressure vertical steel 22, and the side lifting lug 32 is perpendicular to the side pressure vertical steel 22.

[0034] When the above-mentioned lifting device for hoisting and flipping the UHPC arch rib is used, the bottom horizontal steel 12 is brought into contact with the first side surface 101 and the fixed vertical steel 11 is brought into contact with the bottom surface 103, and then the slot 210 of the upper pressure horizontal steel 21 is moved toward the end of the fixed vertical steel 11 away from the bottom horizontal steel 12, so that the fixed vertical steel 11 is inserted into the slot 210. In this process, the end of the bottom horizontal steel 12 away from the fixed vertical steel 11 passes through the avoidance hole 220. At this time, the side pressure vertical steel 22 and the UHP The top surface 104 of the C arch rib is in contact with the upper pressure horizontal steel 21 and the second side surface 102 of the UHPC arch rib. The upper pressure horizontal steel 21 is then connected to the fixed vertical steel 11, and the bottom horizontal steel 12 is connected to the side pressure vertical steel 22. The bottom side steel member 1 and the upper side steel member 2 complete the clamping of the UHPC arch rib. Since both the upper pressure horizontal steel 21 and the side pressure vertical steel 22 are provided with lifting ears, they can be combined with the lifting equipment in the prior art to complete the turning operation of the UHPC arch rib. It can be seen that the present invention provides a lifting device capable of lifting UHPC arch ribs.

[0035] In addition, the bottom steel member 1 and the upper steel member 2 can be welded and assembled using steel materials commonly used at the construction site. They can be manufactured on-site at the construction site according to the UHPC arch rib to be flipped. Combined with the arrangement of the slots 210 and the avoidance holes 220, the assembly of the bottom steel member 1 and the upper steel member 2 can be made easier, highlighting their easy assembly and simple manufacturing characteristics, which can not only save construction costs but also speed up the construction progress.

[0036] In this embodiment, two transverse connecting holes 110 are provided at intervals on the end of the fixed vertical steel 11 away from the bottom horizontal steel 12; matching holes 211 are provided on both sides of the upper pressure horizontal steel 21 corresponding to the slot 210. There are two matching holes 211, and the two matching holes 211 are spaced apart along the length direction of the upper pressure horizontal steel 21. When it is necessary to connect the upper pressure horizontal steel 21 with the fixed vertical steel 11, two sets of connecting parts are prepared. The connecting parts include a screw 16 and two nuts 17. After a screw 16 is inserted from a matching hole 211 on one side of the upper pressure horizontal steel 21, it is sequentially passed through a corresponding transverse connecting hole 110 and a matching hole 211 on the other side. Then, two nuts 17 are screwed into the upper pressure horizontal steel 21 from opposite ends of the screw 16. When the nuts 17 abut against the outer wall of the corresponding side of the upper pressure horizontal steel 21, the connection is completed. When the two sets of connecting parts are connected, the fixed vertical steel 11 and the upper pressure horizontal steel 21 are connected.

[0037] Vertical connection holes 120 are provided on opposite sides of the end of the bottom horizontal steel 12 away from the fixed vertical steel 11. There are two vertical connection holes 120, which are spaced apart along the width direction of the bottom horizontal steel 12. After the avoidance hole 220 is passed through the end of the bottom horizontal steel 12 away from the fixed vertical steel 11, the other two sets of connecting parts are prepared. The screw rods 16 of one set of connecting parts are passed through the vertical connection holes 120 on the upper and lower sides of the bottom horizontal steel 12, and then two nuts 17 are screwed into the bottom horizontal steel 12 from the opposite ends of the screw rods 16. The nuts 17 stop when they abut against the outer wall of the corresponding side of the bottom horizontal steel 12. When the other two sets of connecting parts are connected, the side pressure vertical steel 22 is limited on the bottom horizontal steel 12, that is, the connection between the bottom horizontal steel 12 and the side pressure vertical steel 22 is completed.

[0038] In this embodiment, a fixed anti-scratch layer 13 is provided on the inner wall of the fixed vertical steel 11 and the bottom horizontal steel 12 facing the upper steel member 2. Specifically, a fixed anti-scratch layer 13 is provided on the side of the fixed vertical steel 11 facing the lateral pressure vertical steel 22, and the fixed anti-scratch layer 13 extends along the length of the fixed vertical steel 11; a fixed anti-scratch layer 13 is provided on the side of the bottom horizontal steel 12 facing the upper pressure horizontal steel 21, and the fixed anti-scratch layer 13 extends along the length of the bottom horizontal steel 12. The fixed anti-scratch layer 13 includes a foam liner and a rubber sleeve. The foam liner is sleeved onto the outside of the fixed vertical steel 11 or the bottom horizontal steel 12, and the rubber sleeve is covered on the outside of the corresponding foam liner. The provision of the fixed anti-scratch layer 13 can play an isolating role on the surface of the UHPC arch rib after the fixed vertical steel 11 and the bottom horizontal steel 12 contact the UHPC arch rib, thereby preventing the fixed vertical steel 11 and the bottom horizontal steel 12 made of steel from scratching the outer surface of the UHPC arch rib, especially effectively preventing them from damaging the sharp corners of the UHPC arch rib itself, thereby better ensuring the integrity of the arch rib.

[0039] The upper pressure horizontal steel 21 and the side pressure vertical steel 22 can be removably provided with an inner anti-scratch part 23. Specifically, the upper pressure horizontal steel 21 can be removably provided with an inner anti-scratch part 23, and the side pressure vertical steel 22 can be removably provided with an inner anti-scratch part 23; the inner anti-scratch part 23 includes two limiting bolt parts 231 and a pressure steel plate 234. The two limiting bolt parts 231 are spaced apart along the length direction of the corresponding steel. The limiting bolt parts 231 are detachably connected to the upper pressure horizontal steel 21 or the side pressure vertical steel 22. In detail, an adjustment hole 221 is provided for each limiting bolt part 231 on the upper pressure horizontal steel 21 or the side pressure vertical steel 22; the limiting bolt part 231 includes a limiting screw 232 and two limiting nuts 233. The limiting screw 232 is set through the corresponding adjustment hole 221, and the two limiting nuts 233 are screwed on the limiting screw 232 and are located on opposite sides of the corresponding adjustment hole 221. One side of the pressing steel plate 234 is connected to the two limiting bolts 231. Specifically, one side of the pressing steel plate 234 is connected to one end of the two limiting screws 232 facing the bottom steel member 1. The pressing steel plate 234 installed on the upper pressing horizontal steel 21 extends along the length of the upper pressing horizontal steel 21, and the pressing steel plate 234 installed on the side pressing vertical steel 22 extends along the length of the side pressing vertical steel 22. The inner anti-scratch member 23 is provided with an anti-scratch layer 24 on the side facing the bottom steel member 1. Specifically, the anti-scratch layer 24 is provided on the side of the pressing steel plate 234 facing away from the limiting bolts 231. The anti-scratch layer 24 includes a foam liner and a rubber sleeve. The foam liner is sleeved on the side of the pressing steel plate 234 facing away from the limiting screws 232, and the rubber sleeve is covered on the outside of the foam liner.

[0040] When installing the inner anti-scratch member 23 onto the upper pressure horizontal steel 21 or the side pressure vertical steel 22, the limiting screw 232 is passed through the corresponding adjustment hole 221, and two limiting nuts 233 are screwed onto the limiting screw 232 and abutted against the opposite sides of the corresponding steel. The inner anti-scratch member 23 is installed onto the upper pressure horizontal steel 21 or the side pressure vertical steel 22 by two limiting nuts 233 and one limiting screw 232. By adjusting the length of the limiting screw 232 extending into the corresponding steel toward the side of the bottom steel member 1, the corresponding anti-scratch layer 24 can be abutted against the corresponding surface of the UHPC arch rib, that is, the anti-scratch layer 24 of the upper pressure horizontal steel 21 abuts against the second side surface 102 of the UHPC arch rib, and the anti-scratch layer 24 of the side pressure vertical steel 22 abuts against the top surface 104 of the UHPC arch rib, thereby achieving the ferrule and limiting of the entire UHPC arch rib.

[0041] In this embodiment, the connection between the fixed vertical steel 11 and the bottom horizontal steel 12 is reinforced with a steel plate 14. Specifically, one side of the steel plate 14 is welded to the fixed vertical steel 11, and the other side of the steel plate 14 is welded to the bottom horizontal steel 12. A reinforcing plate 15 is provided on the bottom horizontal steel 12. Specifically, there are several reinforcing plates 15, and the several reinforcing plates 15 are spaced apart along the length direction of the bottom horizontal steel 12. The opposite ends of the reinforcing plates 15 are welded to the inner walls on opposite sides of the bottom horizontal steel 12. When the UHPC arch rib is hoisted, the bottom horizontal steel 12 and the fixed vertical steel 11 play the main role in lifting. At this time, it is mainly the bottom horizontal steel 12 and the fixed vertical steel 11 that support the UHPC arch rib. The provision of the reinforcing plate 15 can further ensure the rigidity of the bottom horizontal steel 12, and the provision of the steel plate 14 can make the connection between the fixed vertical steel 11 and the bottom horizontal steel 12 more stable.

[0042] This embodiment also provides a method for hoisting and flipping a UHPC arch rib, which is used to hoist and flip the UHPC arch rib 100 prefabricated on the arch rib base 200. Figure 4 and Figure 5 Two lifting holes 201 are reserved on the arch rib pedestal 200. After the UHPC arch rib 100 is prefabricated, its first side surface 101 contacts the top surface of the arch rib pedestal 200, and the bottom surface 103 is perpendicular to the top surface of the arch rib pedestal 200. The above method specifically includes the following steps:

[0043] Equipment preparation: Prepare two hoisting tools and two cranes 202 for hoisting and flipping the UHPC arch ribs according to the number of hoisting holes 201;

[0044] Install the bottom steel member 1: Place the bottom horizontal steel 12 in contact with the first side surface 101 and the fixed vertical steel 11 in contact with the bottom surface 103. Specifically, place the fixed anti-scratch layer 13 of the bottom horizontal steel 12 in contact with the first side surface 101 and place the fixed anti-scratch layer 13 of the fixed vertical steel 11 in contact with the bottom surface 103.

[0045] Install the upper steel member 2: adjust the inner anti-scratch piece 23 to a position where the pressing steel plate 234 is close to the corresponding steel member. Specifically, adjust the inner anti-scratch piece 23 on the upper pressing horizontal steel 21 to a position where the pressing steel plate 234 is close to the upper pressing horizontal steel 21, and adjust the inner anti-scratch piece 23 on the side pressing vertical steel 22 to a position where the pressing steel plate 234 is close to the side pressing vertical steel 22. The aforementioned position is sufficient as not to hinder the fixed vertical steel 11 from being inserted into the slot 210; move the slot 210 of the upper pressing horizontal steel 21 toward the end of the fixed vertical steel 11 away from the bottom horizontal steel 12, insert the fixed vertical steel 11 into the slot 210, and the end of the bottom horizontal steel 12 away from the fixed vertical steel 11 passes through the avoidance hole 220;

[0046] Connect the bottom steel member 1 and the upper steel member 2: When the fixed vertical steel 11 is at the bottom of the slot 210, connect the upper horizontal steel 21 with the fixed vertical steel 11. Specifically: prepare two sets of connecting parts, insert a screw 16 into each matching hole 211, insert the screw 16 from the matching hole 211 on one side of the upper horizontal steel 21, and then pass it through the coaxial horizontal connecting hole 110 and the matching hole 211 on the other side in sequence, and then screw two nuts 17 from the opposite ends of each screw 16 toward the upper horizontal steel 21. When the nut 17 and the outer wall of the corresponding side of the upper horizontal steel 21 are against each other, the two sets of connecting parts are connected. When the components are connected, the fixed vertical steel 11 and the upper pressure horizontal steel 21 are connected; the bottom horizontal steel 12 and the side pressure vertical steel 22 are connected. Specifically: prepare two other sets of connecting components, insert a screw 16 into each vertical connecting hole 120, and pass the screw 16 through the vertical connecting holes 120 on the upper and lower sides of the bottom horizontal steel 12 and coaxially arranged, and then screw two nuts 17 from the opposite ends of each screw 16 toward the bottom horizontal steel 12. When the nut 17 contacts the outer wall of the corresponding side of the bottom horizontal steel 12, stop. When the other two sets of connecting components are connected, the bottom horizontal steel 12 and the side pressure vertical steel 22 are connected.

[0047] Adjust the position of the inner anti-scratch part 23: screw the two limiting nuts 233 to the opposite ends of the corresponding limiting screws 232, and move the limiting screws 232 toward the UHPC arch rib 100, until the anti-scratch layer 24 connected to the upper pressure horizontal steel 21 abuts against the second side surface 102 and the anti-scratch layer 24 connected to the side pressure vertical steel 22 abuts against the top surface 104; tighten the two limiting nuts 233 toward the adjustment hole 221 until the two limiting nuts 233 abut against the corresponding steel. Specifically: the two limiting nuts 233 on the upper pressure horizontal steel 21 abut against the opposite sides of the upper pressure horizontal steel 21, and the two limiting nuts 233 on the side pressure vertical steel 22 abut against the opposite sides of the side pressure vertical steel 22, then the anti-scratch layer 24 is limited to a position abutting against the surface corresponding to the UHPC arch rib 100, at this time the bottom steel component 1 and the upper steel component 2 complete the clamping of the UHPC arch rib.

[0048] Arrange the lifting ropes 223: Two cranes 202 are arranged at opposite sides of the arch rib pedestal 200. The lifting ropes 223 of one crane 202 are connected to the top lifting lugs 31. Specifically, the crane 202 is provided with a hook 222. Four lifting ropes 223 are hooked on the hook 222. One end of the four lifting ropes 223 facing away from the hook 222 is connected to the four top lifting lugs 31 on the two bottom steel members 1. The lifting ropes 223 of the other crane 202 are connected to the side lifting lugs 32. Specifically, the other crane 202 is provided with a hook 222. Four lifting ropes 223 are hooked on the hook 222. One end of the four lifting ropes 223 facing away from the hook 222 is connected to the four side lifting lugs 32 on the two upper steel members 2.

[0049] Lifting and flipping the UHPC arch rib 100: the crane 202 connected to the top lifting ear 31 lifts the UHPC arch rib 100. Specifically, the crane 202 connected to the top lifting ear 31 lifts the hook 222 in a direction perpendicular to the top surface of the arch rib pedestal 200, and the corresponding lifting rope 223 lifts the UHPC arch rib 100 in a direction perpendicular to the top surface of the arch rib pedestal 200. During this process, the lifting rope 223 connected to the side lifting ear 32 remains in a relaxed state. When the UHPC arch rib 100 is lifted to a preset height, the crane 202 connected to the side lifting ear 32 lifts the UHPC arch rib 100 in a direction perpendicular to the arch rib pedestal 200, and the UHPC arch rib 100 is gradually flipped. Specifically, the crane 202 connected to the side lifting ear 32 lifts the corresponding hook 222 in a direction perpendicular to the top surface of the arch rib pedestal 200. When the top surface 103 of the UHPC arch rib 100 is lifted in the opposite direction, the corresponding lifting rope 223 gradually pulls the side pressure vertical steel 22 to a position parallel to the top surface of the arch rib pedestal 200. During this process, the hook 222 connected to the top lifting ear 31 gradually descends toward the arch rib pedestal 200, and the UHPC arch rib 100 gradually flips over. When the bottom surface 103 is opposite to the top surface of the arch rib pedestal 200 and the first side surface 101 and the second side surface 102 are both perpendicular to the top surface of the arch rib pedestal 200, the flipping operation of the UHPC arch rib 100 is completed. Specifically, the crane 202 connected to the top lifting ear 31 continues to slowly lower the corresponding lifting hook 222 until the corresponding lifting rope 223 is relaxed and free from stress, and the lifting rope 223 connected to the side lifting ear 32 is fully tightened and is at the top of the side pressure vertical steel 22, the originally horizontally prefabricated UHPC arch rib 100 is completely flipped.

[0050] It can be seen that the above method for flipping the UHPC arch rib 100 has the following effects:

[0051] 1. The lifting device used for hoisting and turning over the UHPC arch rib can effectively protect the UHPC arch rib 100 from damage, and prevent common problems such as corner collapse and cracking during the hoisting and turning process.

[0052] 2. The lifting device used for hoisting and flipping the UHPC arch rib not only assists in flipping the UHPC arch rib 100, but also improves the limiting measures for the UHPC arch rib 100. Specifically, since the main force of the lifting device is to fix the vertical steel 11 and the bottom horizontal steel 12, and the inner anti-scratch member 23 mainly plays a limiting role, it can not only prevent the UHPC arch rib 100 from being damaged by collision due to steel joints during the flipping process, but also prevent the UHPC arch rib 100 from rotating or flipping without restriction during the lifting and flipping process.

[0053] 3. Since the materials required to make the slings used in this method are common steel sections and materials at the construction site, they can be easily assembled and used, making this method easier to implement in actual construction applications.

[0054] 4. The hoist in this method can be used for the hoisting of variable-section arch ribs. It can be partially adjusted within the outer ring steel structure and is more suitable for the hoisting and flipping construction of variable-section arch ribs.

[0055] The above description is a detailed description of the preferred embodiments of the present invention, but the embodiments are not intended to limit the scope of the patent application of the present invention. Any equivalent changes or modifications completed under the technical spirit suggested by the present invention should fall within the patent scope covered by the present invention.

Claims

1. A method for hoisting and flipping a UHPC arch rib, characterized in that: The following steps are involved: Equipment preparation: two hoists and two cranes (202) for hoisting and flipping the UHPC arch rib are prepared according to the number of hoisting holes (201). The hoist for hoisting and flipping the UHPC arch rib includes a bottom steel member (1) and an upper steel member (2). The bottom steel member (1) includes a fixed vertical steel (11) and a bottom horizontal steel (12). The fixed vertical steel (11) is connected to the bottom horizontal steel (12); the upper steel member (2) includes an upper pressure horizontal steel (21) and a side pressure vertical steel (22). The upper pressure horizontal steel (21) is connected to the side pressure vertical steel (22). The end of the upper pressure horizontal steel (21) away from the side pressure vertical steel (22) is provided with a side pressure vertical steel (22) away from the fixed vertical steel (11). 12), the end of the upper pressure horizontal steel (21) away from the side pressure vertical steel (22) is detachably connected to the end of the fixed vertical steel (11) away from the bottom horizontal steel (12); the end of the side pressure vertical steel (22) away from the upper pressure horizontal steel (21) is penetrated by a avoidance hole (220) adapted to the end of the bottom horizontal steel (12) away from the fixed vertical steel (11), the end of the side pressure vertical steel (22) away from the upper pressure horizontal steel (21) is detachably connected to the end of the bottom horizontal steel (12) away from the fixed vertical steel (11); the upper pressure horizontal steel (21) is provided with a top lifting lug (31), and the side pressure vertical steel (22) is provided with a side lifting lug (32); Installing the bottom side steel member (1): contacting the bottom horizontal steel (12) with the first side surface (101) and contacting the fixed vertical steel (11) with the bottom surface (103); Installing the upper steel member (2): moving the slot (210) of the upper pressure horizontal steel (21) toward the end of the fixed vertical steel (11) away from the bottom horizontal steel (12), inserting the fixed vertical steel (11) into the slot (210), and passing the end of the bottom horizontal steel (12) away from the fixed vertical steel (11) through the avoidance hole (220), so that the side pressure vertical steel (22) contacts the top surface (104) of the UHPC arch rib (100) and the upper pressure horizontal steel (21) contacts the second side surface (102) of the UHPC arch rib (100); Connecting the bottom steel member (1) and the upper steel member (2): when the fixed vertical steel (11) is located at the bottom of the slot (210), connecting the upper pressure horizontal steel (21) and the fixed vertical steel (11); connecting the bottom horizontal steel (12) and the side pressure vertical steel (22); Arrangement of the lifting rope (223): The two cranes (202) are arranged on opposite sides of the arch rib pedestal (200), the lifting rope (223) of one crane (202) is connected to the top lifting lug (31), and the lifting rope (223) of the other crane (202) is connected to the side lifting lug (32); Lifting and flipping the UHPC arch rib (100): the crane (202) connected to the top lifting lug (31) lifts the UHPC arch rib (100); after the UHPC arch rib (100) is lifted to a preset height, the crane (202) connected to the side lifting lug (32) lifts the UHPC arch rib (100) in a direction perpendicular to the arch rib pedestal (200); the UHPC arch rib (100) is gradually flipped; when the bottom surface (103) is opposite to the top surface of the arch rib pedestal (200), and the first side surface (101) and the second side surface (102) are both perpendicular to the top surface of the arch rib pedestal (200), the flipping operation of the UHPC arch rib (100) is completed.

2. The method for hoisting and turning over a UHPC arch rib according to claim 1, wherein: The fixed vertical steel (11) and the bottom horizontal steel (12) are both provided with a fixed anti-scratch layer (13) on the inner wall facing the upper steel member (2); the upper pressure horizontal steel (21) and the side pressure vertical steel (22) are both provided with a removable inner anti-scratch piece (23), and the inner anti-scratch piece (23) is provided with an anti-scratch layer (24) on the side facing the bottom steel member (1).

3. The method for hoisting and turning over a UHPC arch rib according to claim 2, wherein: The inner anti-scratch component (23) includes a limiting bolt component (231) and a pressure steel plate (234), wherein the limiting bolt component (231) is detachably connected to the upper pressure horizontal steel (21) or the side pressure vertical steel (22), and one side of the pressure steel plate (234) is connected to the limiting bolt component (231); the anti-scratch layer (24) is provided on the side of the pressure steel plate (234) facing away from the limiting bolt component (231).

4. The method for hoisting and turning over a UHPC arch rib according to claim 3, wherein: An adjustment hole (221) is provided on the upper pressure horizontal steel (21) or the side pressure vertical steel (22); the limiting bolt member (231) includes a limiting screw (232) and two limiting nuts (233), the limiting screw (232) is arranged to pass through the adjustment hole (221), and the two limiting nuts (233) are screwed onto the limiting screw (232) and are located on opposite sides of the adjustment hole (221); one side of the pressure steel plate (234) is connected to one end of the limiting screw (232) toward the bottom side steel member (1); After the step of "connecting the bottom steel member (1) and the upper steel member (2)", the step of "adjusting the position of the inner anti-scratch member (23)" is included: screwing the two limiting nuts (233) to the opposite ends of the corresponding limiting screws (232), moving the limiting screws (232) toward the UHPC arch rib (100), and stopping when the anti-scratch layer (24) connected to the upper pressure horizontal steel (21) abuts against the second side surface (102) and the anti-scratch layer (24) connected to the side pressure vertical steel (22) abuts against the top surface (104); tightening the two limiting nuts (233) toward the adjustment hole (221) until the two limiting nuts (233) abut against the corresponding steel.

5. The method for hoisting and turning over a UHPC arch rib according to claim 4, characterized in that: The anti-scratch layer (24) comprises a foam liner and a rubber sleeve, the foam liner is sleeved on the side of the pressing steel plate (234) away from the limiting screw (232), and the rubber sleeve is covered on the outside of the foam liner.

6. The method for hoisting and turning over a UHPC arch rib according to claim 1, wherein: The fixed vertical steel (11) is provided with a transverse connecting hole (110) at one end away from the bottom horizontal steel (12), and the upper pressure horizontal steel (21) is provided with matching holes (211) on both sides corresponding to the slot (210), a screw rod (16) is sequentially passed through the transverse connecting hole (110) and the matching hole (211) and two nuts (17) are screwed into the screw rod (16) to abut against the upper pressure horizontal steel (21); the bottom horizontal steel (12) is provided with vertical connecting holes (120) on opposite sides of one end away from the fixed vertical steel (11), another screw rod (16) is sequentially passed through the vertical connecting holes (120) on opposite sides of the bottom horizontal steel (12) and another two nuts (17) are screwed into the screw rod (16) to abut against the bottom horizontal steel (12).

7. The method for hoisting and turning over a UHPC arch rib according to claim 6, wherein: The connection between the fixed vertical steel (11) and the bottom horizontal steel (12) is reinforced with a steel plate (14); and a reinforcing plate (15) is provided on the bottom horizontal steel (12).

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