Steel frame internal arch structure and flexible back-pulling hoisting construction method thereof

Abstract

A construction method for installing an internal arched structure within a steel frame and its flexible back-tensioning relay is disclosed. The structure includes a main building steel frame and an internal steel structure. The internal steel structure is fixedly connected to the vertical edge steel frame via a floor horizontal beam structure. The vertical edge steel frame includes side frames and a back frame. The area within the first two rows of frame columns of the side frames is the arch zone, and the area between the arch zone and the back frame is the non-arch zone. The internal steel structure includes an arched structure and an arch zone suspension structure. The arched structure includes arched steel members and connecting beams, with the connecting beams located between two arched steel members. The arch zone suspension structure includes hanging columns, which are vertically continuous and positioned between the floor beams in the arch zone. The hanging columns are connected to the arched steel members by pins. In this invention, the arched steel members pass through the floor horizontal beam structure, changing the stress on the overall steel structure and completing the stress transfer of the arched steel members within the frame structure. By employing flexible back-tensioning technology for the arched structure, the installation of the arched steel members and their under-arch suspension structure is carried out safely and accurately.

Description

Technical Field

[0001] This invention belongs to the field of steel structure buildings, and in particular to an internal arched structure of a steel structure building and its construction method. Background Technology

[0002] With increasingly complex architectural designs, arched components are being used more and more in steel structure designs to meet diverse architectural aesthetic requirements. Existing arched components typically form the main framework of roof structures, with structural supports at both ends, usually columns or walls. During construction, they are typically hoisted as a whole or in sections from the outside. However, when arched structures are designed to incorporate internal structural elements, it becomes necessary to consider how to coordinate the construction of the arched structure with the frame structure, rendering existing construction methods unusable. Furthermore, when construction sites are limited, especially during the installation of arched components, it is often necessary to use cranes to install temporary vertical supports on the ground or structure below. These temporary supports are then removed after the arched component is connected to other structures. This method of using temporary vertical supports is extremely expensive in terms of materials, requires a large area, and consumes significant amounts of machinery and personnel during installation and dismantling, while also posing safety hazards during construction.

[0003] Especially when on-site construction conditions do not allow for the erection of vertical temporary supports, it is difficult to adjust the tilt angle of the arched components during construction and installation using only a crane. This also makes it difficult to position the arched components when connecting them to other components, requiring multiple mechanical lifting operations. Summary of the Invention

[0004] The novel purpose of this invention is to provide a flexible back-pull relay hoisting construction method for an arched structure inside a steel frame. It aims to solve the stress problem when the arched structure is designed inside the steel frame, the difficulty in adjusting the angle of a single support point of the vertical temporary support during the installation of the arched structure, the difficulty in positioning when connecting with other components, and the technical problems of high mechanical, personnel, and cost consumption and high risk during the construction and dismantling process.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] An internal arched structure within a steel frame includes a main building steel frame and an internal steel structure. The front center of the main building steel frame is recessed to form a C-shaped space. The edge structures of the main building steel frame on three sides of the C-shaped space include vertical edge steel frames enclosing three sides. The internal steel structure is located within the C-shaped space and is fixedly connected to the vertical edge steel frames via a floor horizontal beam structure.

[0007] The vertical edge steel frame includes side frames located opposite each other on the left and right sides of the internal steel structure and a back frame located on the back side of the internal steel structure. Each side edge steel frame includes frame columns and frame beams arranged in layers between the fixedly connected frame columns. The frame columns stand on the ground. The area within the first two rows of frame columns of the side frames is the arch zone, and these two rows of frame columns are the main columns of the arch zone. The frame beams between the main columns of the arch zone of the same side frame are the main beams of the arch zone. The area between the arch zone and the back frame is the non-arch zone, and the frame columns of the back frame are the main columns of the non-arch zone. The frame beams between the main columns of the arch zone and the main columns of the non-arch zone are the main beams of the non-arch zone. The frame beams between the main columns of the arch zone and the main columns of the non-arch zone in the rear row are the main beams of the interval.

[0008] The floor horizontal beam structure is arranged in layers at intervals along the height direction of the frame columns and corresponding to the positions of each frame beam. Each layer includes arched floor beams and non-arched floor beams.

[0009] The arched floor beams include arched floor main beams and arched floor secondary beams. The two ends of the arched floor main beams are respectively fixedly connected between the corresponding arched floor main columns in the left and right opposite side frames. The arched floor secondary beams are vertically spaced between the two arched floor main beams on the same floor, and the two ends of the arched floor secondary beams are respectively fixedly connected between the arched floor main beams on the same floor.

[0010] The non-arched floor beams include non-arched floor secondary beams, which are perpendicular to the arched floor main beams. The two ends of the non-arched floor secondary beams are fixedly connected to the rear arched floor main beams and the non-arched floor main beams, respectively.

[0011] The internal steel structure includes an arched structure and an arched suspension structure.

[0012] The arch structure includes two parallel arch steel members and a connecting beam. The distance between the two arch steel members is equal to the distance between the main columns of the arch area. Each arch steel member corresponds to the main column of the arch area and is located in the same vertical plane, which is the arch surface. The arch steel members are interspersed with the horizontal beam structure of each floor in each arch surface. The steel members that the arch steel members pass through are all cut off and fixedly connected to the arch steel members. The two ends of the arch steel members extend out of the side frame, and the extension position is the top of the support section of the arch steel members. The bottom end of the support section stands obliquely on the ground.

[0013] The connecting beam is located between two arched steel members and is used to fix the two arched steel members together as a whole. The connecting beam is set at intervals along the arc of the arched steel members. The setting position of the connecting beam corresponds to the position of the floor beam of each arched area. The connecting beam is an additional secondary beam of the floor of the arched area. The rear end of the connecting beam extends backward and is fixedly connected to the back frame. The connection position is located on the main beam of the non-arched area and / or on the beam-column connection node between the main beam of the non-arched area and the main column of the non-arched area. The extended part is an additional secondary beam of the floor of the non-arched area.

[0014] The arch suspension structure includes hanging columns, which are vertically continuous and set between the floor beams of the bottom and top arch areas. The hanging columns are located within the arch surface and are symmetrically spaced to both sides with the apex of the arch steel member as the boundary. The hanging columns are inserted and fixedly connected to the connection nodes of the secondary beams and main beams of the arch area floor in the horizontal beam structure of each floor within each arch surface. Each hanging column includes a lower hanging column located below the arch steel member and an upper hanging column located above the arch steel member, with the arch steel member as the boundary. The hanging columns and the arch steel member are connected by pins.

[0015] The main beams in the arch area are all equipped with figure-eight reinforcing diagonal braces; the floor beams in the arch area also include groups of cross-shaped reinforcing diagonal braces, with each group consisting of three secondary floor beams in the arch area forming a unit.

[0016] The non-arched floor beams are set down one more layer than the arched floor beams to form the non-arched floor beams of the first floor, including two rows of non-arched floor main beams of the first floor. The front row of non-arched floor main beams is set directly below the arched floor main beams of the second floor, and the rear row of non-arched floor main beams is set directly below the non-arched floor main beams of the second floor. There are also non-arched floor secondary beams between the front row of non-arched floor main beams and the rear row of non-arched floor main beams.

[0017] The arched steel components are divided into front arches and rear arches. The hanging columns of the rear arches extend downward to form the bottom section of the interval. The two ends of the bottom section are fixedly connected between the main beam of the arched area floor on the second floor and the main beam of the non-arched area floor on the front floor.

[0018] The floor beams in the arched area of ​​the second floor are positioned at the top of the support section.

[0019] A flexible back-tension relay hoisting construction method for an internal arched structure of a steel frame, the construction steps of which are as follows:

[0020] Step 1: Construct the main building steel frame, including the vertical edge steel frames on three sides, and simultaneously complete the pouring of concrete for each floor slab to reach the design strength, meeting the installation conditions of the steel structure within the C-shaped space. The support section and the main column of the arch area are constructed as a whole.

[0021] Step two: At the front of the C-shaped space, use a truck crane for hoisting. Before hoisting, install safety poles, fall arrestors, or ladders on the upper surface of the first arch section of the rear arch. Temporarily fix and splice the first arch section and the support section using a temporary arch section splicing device. Then, adjust the installation position of the first arch section and the support section using an arch section adjustment device of the temporary fixing structure. Once the conditions for unhooking the crane are met, unhook the crane.

[0022] Step 3: Weld the first temporary rigid diagonal brace between the first arch segment and the main column of the arch area to constrain the in-plane welding deformation of the arch steel component;

[0023] Step four: Repeat steps two and three to install the first arch section of the front row of arches;

[0024] Step 5: Use a tower crane close to the installation side to install the connecting beam. After installation, weld the main welds between the first arch section and the support section of the rear arch and the front arch.

[0025] Step six: Repeat steps two through five to install the first arch segment on the opposite side using the same method;

[0026] Step 7: Using a second truck crane, repeat steps 2 to 6 to install the second arch section on the first arch section. Weld the second temporary rigid diagonal brace between the second arch section and the main column of the arch area. After welding, remove the wire rope of the upper arch section adjustment device of the first arch section, retain the first temporary rigid diagonal brace, and hang a horizontal net under the floor beam of the first arch area to prevent falls from height.

[0027] Step 8: Using a third truck crane, repeat steps 2 to 6 to install the third arch segment on the second arch segment. Based on the simulated deformation height of the arch segment, adjust the pre-lifting height of the arch segment during positioning to ensure that the welded arch segment meets the design accuracy. Weld a third temporary rigid diagonal brace between the third arch segment and the main column of the arch area. This arch segment must have its main weld completed before the truck crane is unhooked, at least / length. Continue welding after unhooking. After welding is completed, remove the wire rope of the arch segment adjustment device on the second arch segment, and retain the third temporary rigid diagonal brace.

[0028] Step 9: Install the closing section of the arch segment. Measure the actual dimensions of the closing section in advance, verify the component dimensions, and weld the two arch segments in the front and rear rows in sequence. After all welding work is completed, conduct arch segment acceptance.

[0029] Step 10: After the arch section passes the acceptance test, remove the steel wire rope of the upper arch section adjustment device of the third arch section and the first, second and third temporary rigid diagonal bars. During the removal process, deformation monitoring should be carried out, and the deformation data should be compared with the construction simulation data. If the design requirements are met, the next installation process can proceed. According to the calculation, the main arch deformation is less than 10% after the temporary rigid diagonal bars are removed, which is considered acceptable.

[0030] Step 11: Use the fourth truck crane to install the lifting columns of the rear arches, using a crane cage or aerial work platform as the operating platform; according to the construction simulation, first install the under-arch lifting columns inside the rear arch surface, and then install the under-arch lifting columns inside the front arch surface, so as to minimize the impact on arch deformation.

[0031] Step 12: Using the fourth truck crane, install the main beams of the arch area floor of the second floor of the rear arch section from the two sections toward the middle. After the installation is completed, the whole structure is straightened and welded from the middle section toward both ends.

[0032] Step thirteen: Use the fourth truck crane to install the bottom section of the rear arch section;

[0033] Step fourteen: Use the fourth truck crane to install the main beam of the non-arch area floor below the rear arch; after installation, perform overall alignment and welding from the middle section to both ends;

[0034] Step 15: Using the fourth truck crane, install the main beams of the arch area floor between the arch-supported columns in the rear arch surface from bottom to top;

[0035] Step 16: Install the main floor beams of the arch area between the under-arch columns and the under-arch columns of the front arch using the same installation method as the rear arches;

[0036] Step 17: Install the secondary beams of the non-arched area of ​​the first floor using a tower crane;

[0037] Step 18: Use a tower crane or truck crane to install all the remaining arched floor beams and non-arched floor beams on the second floor.

[0038] Step 19: Repeat step 18, using a tower crane or truck crane to install all remaining third and fourth floor arch beams and non-arch beams.

[0039] Step 20: Use a tower crane or truck crane to install all the remaining five arched floor beams, non-arched floor beams, and arch-mounted columns.

[0040] Step 21: Using a tower crane or truck crane, install all the floor beams in the six-story arched area and the floor beams in the non-arched area. The internal steel structure installation is now complete.

[0041] Step 22: Lay floor slabs on the floor beams from the ground floor upwards, and pour floor slab concrete. The construction of the building within the C-shaped space is now complete.

[0042] In step two, the temporary arch segment assembly device is installed on the arch column segment. The arch column segment includes a support segment and a first arch segment, and includes a positioning plate, splicing lugs, fixing clamps, and fixing bolts. The splicing positions are defined as the lower and upper sides based on the elevation.

[0043] The positioning plates are diagonally symmetrically arranged on the upper and lower sides of the splicing position, including a lower positioning plate set on the lower side of the top end of the support section and an upper positioning plate set on the upper side of the bottom end of the first arch section. Half of the positioning plate is fixedly connected to the arch column section, and the other half extends out of the arch column section and into the splicing position. The bottom end of the first arch section is locked and limited on the top end of the support section by the positioning plates on the upper and lower sides of the splicing position, so that the bottom surface of the first arch section is in contact with the top surface of the support section. The positioning plates form a vertical limiting member.

[0044] The splicing lugs include lower splicing lugs provided on both the upper and lower sides of the top end of the support section, and upper splicing lugs provided on both the upper and lower sides of the bottom end of the first arch section. The lower and upper splicing lugs are paired at the splicing position and located in the same vertical plane. The splicing lugs have splicing lug holes.

[0045] The fixing clamp is fitted to each pair of splicing ear plates and clamped on both sides of each pair of splicing ear plates. The upper splicing ear plate is clamped at the top of the fixing clamp and the lower splicing ear plate is clamped at the bottom of the fixing clamp. The fixing clamp has a fixing clamp hole corresponding to the splicing ear plate hole. The fixing clamp hole and the splicing ear plate hole are anchored by fixing bolts.

[0046] Workers stand on the main structural floor beams of the completed main building steel frame and adjust the installation angle and posture of the first arch segment using an arch segment adjustment device. The arch segment adjustment device, the structural lifting lugs of the main columns in the arch area, and the adjustment lifting lugs of the first arch segment are all located above the main structural floor beams of the main building steel frame. The arch segment adjustment device includes a chain hoist, a main hoisting wire rope, an adjustment wire rope, and a safety rope. One end of the main hoisting wire rope is connected to the structural lifting lug, and the other end is connected to the chain hoist. One end of the adjustment wire rope is connected to the adjustment lifting lug, and the other end is connected to the chain hoist. The chain hoist is located above the main structural floor beams and is adjusted by the workers pulling it. One end of the safety rope is fixedly connected to the main hoisting wire rope, and the other end is fixedly connected to the adjustment lifting lug.

[0047] The first arch section is equipped with two layers of connecting brackets that connect to the floor beams of the arch area, namely upper brackets and lower brackets, which correspond to the floor beams of the two main structural layers respectively.

[0048] The temporary arch segment assembly device is located below the main structural floor beam corresponding to the lower corbel;

[0049] The arch section adjustment device is located above the main structural floor beam corresponding to the upper corbel.

[0050] Two lower positioning plates are symmetrically arranged on the support section along the column axis of the arched steel component. The lower half of the lower positioning plate is fixedly connected to the support section, and the upper half of the lower positioning plate extends out of the splicing position.

[0051] Two upper positioning plates are symmetrically arranged on the first arch section to be installed, with the column axis of the arch column section as the upper half of the upper positioning plate is fixedly connected to the first arch section to be installed, and the lower half of the upper positioning plate extends out of the splicing position.

[0052] The splicing ear plates are symmetrically arranged on the left and right sides of the column axis of the arch column section and located on the outside of the positioning plate. There are two splicing ear plates on each side of the upper section and two splicing ear plates on each side of the lower section.

[0053] The bottom of the upper splicing ear plate is higher than the bottom end face of the first arch section, and the top of the lower splicing ear plate is lower than the top end face of the support section. The splicing ear plate holes are vertically spaced at no less than three on both the upper and lower splicing ear plates.

[0054] The fixing clamp includes an inner plate disposed inside the splicing ear plate and an outer plate disposed outside the splicing ear plate. The inner plate is pre-connected to the splicing ear plate and forms a left and right limiting member.

[0055] The width of the fixing clamp is smaller than the width of the splicing ear plate, and the outer edges of both are flush.

[0056] Step two consists of the following steps:

[0057] Step a: Pre-fix the lower splicing ear plate and the lower side positioning plate to the predetermined position of the support section; pre-fix the upper splicing ear plate and the upper side positioning plate to the predetermined position of the first arch section; then temporarily connect the inner plate to the upper splicing ear plate in advance with fixing bolts.

[0058] Step b: The first arch segment is lifted to the connection position, and then the arch segment adjustment device is pre-connected to the first arch segment;

[0059] Step c: Workers climb onto the main structure floor beams to operate the arch section adjustment device. The crane gradually lifts the first arch section to the predetermined position, and then the temporary arch column splicing device is assembled and connected in place. The inner plate acts as a horizontal limiting component to restrict the horizontal position of the first arch section, and the positioning plates on the upper and lower sides act as vertical limiting components to restrict the vertical position of the first arch section. The first arch section is connected in one go. During this process, workers assist in the installation posture and angle of the arch column by operating the arch section adjustment device.

[0060] Step d: After the adjustment is completed, the workers use the ladder set on the back side of the arch column to climb to the position, splice the outer plate of the fixing clamp into place, and then tighten all the fixing bolts.

[0061] Step e: Connect the first temporary rigid diagonal brace between the first arch segment and the main column of the arch area, and then remove the arch segment adjustment device.

[0062] Compared with the prior art, the present invention has the following features and beneficial effects:

[0063] The arch structure of this invention includes arched steel components, hanging columns, and horizontal floor beams. The arched steel components pass through the horizontal floor beams, altering the overall stress on the steel structure. The floor beams within the arched surface of the arched steel components act as tension beams for the arched steel components, while the remaining horizontal floor beams serve as connecting structures between the arched surfaces. The horizontal floor beams fulfill two functions. The hanging columns are connected to the arched steel components via pins, connecting the horizontal floor beams on each floor and completing the stress transfer of the arched steel components within the frame structure. Therefore, ensuring the safe and precise installation of the arched steel components and their supporting hanging structures is a key focus of this invention.

[0064] This invention employs a flexible back-pull relay hoisting technology with an arched structure during construction. Based on the structural characteristics and design requirements, the arched steel components are installed after the podium structure is capped and the floor slab concrete structure reaches its design strength. Since temporary supports cannot be erected beneath the arched steel components on-site, this flexible back-pull technology is used. Specifically, for each section of the arch beam hoisted, a temporary arch segment splicing device is used to connect its upper surface to the existing podium structure steel columns as a temporary fixing measure for the arched structure. Simultaneously, an arch segment adjustment device is used for adjustment, and the adjusted steel wire rope is retained. Finally, the back-pull relay is performed layer by layer according to the construction section, greatly improving installation efficiency. Subsequent precise correction is convenient and quick, and the accuracy meets the requirements.

[0065] To address the difficulty in positioning arched components, this invention employs a temporary fixing device at the interface between the section to be installed and the already installed section. This device uses pre-connected positioning plates on symmetrical upper and lower sides for vertical locking and limiting during installation. Simultaneously, a horizontal limiting component is formed by the pre-connection of a fixing clamp and a splicing ear plate, providing horizontal limiting during installation. This allows for one-step positioning of the arch section to be installed. The temporary fixing device at the interface enables rapid and precise alignment, avoiding repeated adjustments and wasted time. Finally, fixing bolts anchor the ear plate and clamp together, enabling rapid placement of the arch section, eliminating the need for high-altitude supports, improving construction efficiency, and reducing construction costs.

[0066] To address the problem of the difficulty in adjusting the angle of a single support point for vertical temporary supports, this invention employs an adjustment device at the top of the arch column, including lifting lugs, wire ropes, and chain hoists. This device assists in adjusting the angle and posture of the arch column during positioning, and the hook can be released once the basic design requirements are met. This avoids the need for high-altitude supports, reduces construction costs and operational risks, and the device is reusable, thus reducing the cost of hoisting machinery. Attached Figure Description

[0067] The present invention will now be described in further detail with reference to the accompanying drawings.

[0068] Figure 1 This is a schematic diagram of the location of the C-shaped space of the present invention.

[0069] Figure 2 This is a schematic diagram of the overall front structure of the internal steel structure of this invention.

[0070] Figure 3 yes Figure 1 A side view structural diagram.

[0071] Figure 4 This is a schematic diagram of the overall rear structure of the internal steel structure of the present invention.

[0072] Figure 5 yes Figure 1 A schematic diagram of the structure viewed from below.

[0073] Figure 6 This is a structural schematic diagram of the floor beams in the arch area.

[0074] Figure 7 This is a structural diagram of the floor beams in the non-arched area.

[0075] Figure 8 This is a structural schematic diagram of a coupling beam.

[0076] Figure 9 This is a schematic diagram of the installation structure of the arch section adjustment device, taking the first arch section as an example.

[0077] Figure 10 This is a schematic diagram of the installation structure of the temporary splicing device and the arch section adjustment device, taking the first arch section as an example.

[0078] Figure 11 This is a structural diagram of the hanging column.

[0079] Figure 12 This is a structural diagram of three temporary rigid diagonal braces.

[0080] Figure 13 This is a structural diagram showing the completed installation of the first arch segment.

[0081] Figure 14 yes Figure 13 A schematic diagram of the temporary assembly device.

[0082] Figure 15 yes Figure 13 A schematic diagram of the regulating device.

[0083] Figure 16 yes Figure 13 A structural diagram illustrating the installation process of the first arch segment.

[0084] Figure 17 yes Figure 16 A schematic diagram of the temporary assembly device.

[0085] Figure 18 This is a schematic diagram of the structure where the inner panels are pre-connected at the upper assembly position.

[0086] Figure 19 This is a schematic diagram of the pre-connected inner panels at the lower assembly position.

[0087] Figure 20 This is a schematic diagram of the installation process of the outer panel of the fixed clamp.

[0088] Figure 21 This is a schematic diagram of the structure after the fixed clamp is installed.

[0089] Figure 22 This is a schematic diagram of the vertical edge steel frame of the present invention.

[0090] Figure 23 This is a schematic diagram of the completed structure after step three of the construction method.

[0091] Figure 24 This is a schematic diagram of the completed structure after step four of the construction method.

[0092] Figure 25 This is a schematic diagram of the completed structure after step five of the construction method.

[0093] Figure 26 This is a schematic diagram of the completed structure after step six of the construction method.

[0094] Figure 27 This is the structural diagram showing the completion of step seven of the construction method.

[0095] Figure 28 This is the eighth step of the construction method, a schematic diagram of the completed structure.

[0096] Figure 29 This is a schematic diagram of the completed structure after step nine of the construction method.

[0097] Figure 30 This is the eleventh step of the construction method, a schematic diagram of the completed structure.

[0098] Figure 31 This is the twelfth step of the construction method, a schematic diagram of the completed structure.

[0099] Figure 32 This is the thirteenth step of the construction method, and the structural diagram shows the completed construction.

[0100] Figure 33 This is the fourteenth step of the construction method, a schematic diagram of the completed structure.

[0101] Figure 34 This is step fifteen of the construction method, and a schematic diagram of the completed structure.

[0102] Figure 35 This is the sixteenth step of the construction method, a schematic diagram of the completed structure.

[0103] Figure 36 This is the seventeenth step of the construction method, a schematic diagram of the completed structure.

[0104] Figure 37 This is the eighteenth step of the construction method, a schematic diagram of the completed structure.

[0105] Figure 38 This is the nineteenth step of the construction method, and the structural diagram shows the completed construction.

[0106] Figure 39 This is step 20 of the construction method, a schematic diagram of the completed structure.

[0107] Figure 40 This is step twenty-one of the construction methods, a schematic diagram of the completed structure.

[0108] Attached diagram labels: 1 - Side frame, 11 - Main column in the arch area, 12 - Main beam in the arch area, 121 - Diagonal brace, 13 - Main beam in the section, 2 - Back frame, 201 - Main column in the non-arch area, 202 - Main beam in the non-arch area, 3 - Floor beam in the arch area, 31 - Main beam in the arch area, 311 - Upper corbel, 312 - Lower corbel, 32 - Secondary beam in the arch area, 33 - Cross-shaped diagonal brace, 4 - Floor beam in the non-arch area 41 - Main beam of non-arched floor area, 42 - Secondary beam of non-arched floor area, 5 - Arched structure, 5a - Front row of arches, 5b - Rear row of arches, 51 - Arched steel components, 511 - Support section, 512 - First arch section, 513 - Second arch section, 514 - Third arch section, 515 - Closing section, 52 - Connecting beam, 6 - Temporary arch section assembly device, 61 - Positioning plate, 611 - Lower side positioning plate, 61 2 - Upper positioning plate, 62 - Splicing ear plate, 621 - Lower section splicing ear plate, 622 - Upper section splicing ear plate, 623 - Splicing ear plate hole, 63 - Fixing clamp plate, 631 - Fixing clamp plate hole, 632 - Inner plate, 633 - Outer plate, 64 - Fixing bolt, 7 - Arch section adjustment device, 71 - Chain hoist, 72 - Main hoisting wire rope, 73 - Adjusting wire rope, 74 - Safety rope, 8 - Structural lifting lug, 9 - Adjusting lifting lug, 10 - Lifting column, 101 - Under-arch lifting column, 102 - Upper-arch lifting column, 103 - Bottom section of the section, 14 - First truck crane, 15 - First temporary rigid diagonal brace, 16 - Second truck crane, 17 - Second temporary rigid diagonal brace, 18 - Third temporary rigid diagonal brace, 19 - Fourth truck crane, 20 - Main structure floor beam, 21 - C-shaped space, 22 - Third truck crane. Detailed Implementation

[0109] See the examples. Figure 1 As shown, in this embodiment, the podium building has a large span of 41.6m × 29.08m within the range of floors 2-6, which is converted using an arch structure. An internal arched structure within a steel frame includes a main building steel frame and an internal steel structure. The front center of the main building steel frame is recessed to form a C-shaped space 21. The edge structures of the main building steel frame on three sides of the C-shaped space 21 include three enclosed vertical edge steel frames. The internal steel structure is located within the C-shaped space 21 and is fixedly connected to the vertical edge steel frames through a floor horizontal beam structure.

[0110] See Figure 2-5As shown, the vertical edge steel frame includes side frames 1 located opposite each other on the left and right sides of the internal steel structure and a back frame 2 located on the back side of the internal steel structure. Each edge steel frame includes frame columns and frame beams arranged in layers between the fixedly connected frame columns. The frame columns stand on the ground. The area where the first two rows of frame columns of the side frame 1 are located is the arch area. These two rows of frame columns are the main columns 11 of the arch area. The frame beams between the main columns 11 of the same side frame 1 are the main beams 12 of the arch area. The area between the arch area and the back frame 2 is the non-arch area. The frame columns of the back frame 2 are the main columns 201 of the non-arch area. The frame beams between the main columns 201 of the non-arch area are the main beams 202 of the non-arch area. The frame beams between the main columns 11 of the arch area and the main columns 201 of the non-arch area in the back row are the main beams 13 of the interval.

[0111] The floor horizontal beam structure is arranged in layers at intervals along the height of the frame columns, corresponding to the positions of each frame beam. Each layer includes arched floor beams 3 and non-arched floor beams 4. In this embodiment, there are six layers of arched floor beams 3 and five layers of non-arched floor beams 4.

[0112] See Figure 6 As shown, the arched floor beam 3 includes an arched floor main beam 31 and an arched floor secondary beam 32. The two ends of the arched floor main beam 31 are respectively fixedly connected between the corresponding arched floor main columns 11 arranged on the left and right sides of different side frames 1. The arched floor secondary beam 32 is vertically spaced between the two arched floor main beams 31 on the same floor, and the two ends of the arched floor secondary beam 32 are respectively fixedly connected between the arched floor main beams 31 on the same floor.

[0113] See Figure 7 As shown, the non-arched floor beam 4 includes a non-arched floor secondary beam 42, which is perpendicular to the arched floor main beam 31. The two ends of the non-arched floor secondary beam 42 are respectively fixedly connected between the rear arched floor main beam 31 and the non-arched floor main beam 202.

[0114] The internal steel structure includes an arched structure 5 and an arched suspension structure:

[0115] See Figure 2-5 As shown, the arch structure 5 includes two arch steel members 51 arranged in parallel front and rear and a connecting beam 52. The distance between the two arch steel members 51 is equal to the distance between the main columns 11 in the arch area. Each arch steel member 51 corresponds to the corresponding main column 11 in the arch area and is located in the same vertical plane, which is the arch surface. The arch steel members 51 are interspersed with the horizontal beam structure of each floor in each arch surface. The steel members through which the arch steel members 51 pass are all cut off and fixedly connected to the arch steel members 51. The two ends of the arch steel members 51 extend out of the side frame 1, and the extension position is the top of the support section 511 of the arch steel members 51. The bottom end of the support section 511 stands obliquely on the ground.

[0116] See Figure 8 As shown, the connecting beam 52 is located between two arched steel members 51, and the two arched steel members 51 are fixedly connected as a whole. The connecting beam 52 is set at intervals along the arc of the arched steel members 51. The setting position of the connecting beam 52 corresponds to the position of the floor beam 3 of each arched area. The connecting beam 52 is an additional secondary beam 32 of the arched area floor. The rear end of the connecting beam 52 extends backward and is fixedly connected to the back frame 2. The connection position is located on the main beam 202 of the non-arched area and / or on the beam-column connection node between the main beam 202 of the non-arched area and the main column 201 of the non-arched area. The extended part is an additional secondary beam 42 of the non-arched area floor.

[0117] See Figure 11 As shown, the arch suspension structure includes hanging columns 10, which are vertically continuous and positioned between the floor beams 3 of the bottom and top arch areas. The hanging columns 10 are located within the arch surface and are symmetrically spaced to both sides, with the apex of the arched steel member 51 as the boundary. The hanging columns 10 are interspersed and fixedly connected within each arch surface to the connection nodes between the secondary beams 32 and the main beams 31 of the arch area floor in the horizontal beam structure of each floor. Each hanging column 10 includes a lower arch hanging column 101 located below the arched steel member 51 and an upper arch hanging column 102 located above the arched steel member 51, with the arched steel member 51 as the boundary. The hanging columns 10 and the arched steel member 51 are all connected by pins.

[0118] See Figure 6 As shown, the main beams 12 in the arch area are all provided with figure-eight reinforcing diagonal braces 121; the floor beams 3 in the arch area also include groups of cross reinforcing diagonal braces 33, and every three secondary floor beams 32 in the arch area form a unit of one group.

[0119] See Figure 3 , 5 As shown in Figures 7 and 8, the non-arched floor beam 4 is provided one more layer downward than the arched floor beam 3 to form the non-arched floor beam 4 of the first floor, including two rows of non-arched floor main beams 41 of the first floor. The front row of non-arched floor main beams 41 is located directly below the arched floor main beam 31 of the second floor, and the rear row of non-arched floor main beams 41 is located directly below the non-arched floor main beam 202 of the second floor. There are also non-arched floor secondary beams 42 between the front row of non-arched floor main beams 41 and the rear row of non-arched floor main beams 41.

[0120] The arched steel component 51 is divided into a front arch 5a and a rear arch 5b. The hanging column 10 of the rear arch 5b extends downward to form the bottom section 103 of the interval. The two ends of the bottom section 103 are respectively fixedly connected between the main beam 31 of the arched floor of the second floor and the main beam 41 of the non-arched floor of the front row.

[0121] See Figure 5 As shown, the elevation of the second-floor arch beam 3 is located at the top of the support section 511.

[0122] The construction steps for this flexible back-tension relay hoisting method for the internal arched structure of the steel frame are as follows:

[0123] Before construction: Due to the large beam cross-section of the arched steel components (900mm×800mm×80mm), and the complex connections between the arched steel components and floor beams, horizontal braces, under-arch columns, and above-arch columns, the nodes were intricate. Therefore, Tekla software was used for detailed component design. Taking into account the performance of the tower crane and truck crane on site, the components were rationally segmented to minimize high-altitude work, fully utilize the lifting equipment's performance, and improve on-site construction efficiency. Midas software was used to simulate the construction process, calculating the components and the steel wire ropes, clamps, bolts, etc., to ensure construction safety.

[0124] Step 1, Participate Figure 1 As shown, the main building steel frame includes the vertical edge steel frames on three sides. At the same time, the concrete of each floor slab is poured and reaches the design strength to meet the installation conditions of the steel structure in the C-shaped space. Among them, the support section 511 and the main column 11 of the arch area are constructed as a whole.

[0125] Step 2: The first truck crane 14 is used to lift the first arch section 512 of the rear arch at the front of the C-shaped space. Before lifting, a safety pole, fall arrestor, or ladder is installed on the upper surface of the first arch section 512 of the rear arch. The first arch section 512 and the support section 511 are temporarily fixed and spliced ​​by the temporary arch section splicing device 6 of the temporary fixing structure. Then, the installation position of the first arch section 512 and the support section 511 is adjusted by the arch section adjustment device 7 of the temporary fixing structure. The hook is removed after the conditions for the crane to be unhooked are met. The operating platform is a welding platform.

[0126] Step 3: Weld the first temporary rigid diagonal brace 15 between the first arch segment and the main column 11 of the arch area to constrain the welding deformation within the plane of the arch steel member 51. See [link / reference]. Figure 23 As shown.

[0127] Step four: Repeat steps two and three to install the first arch section of the front row of arches, see below. Figure 24 As shown.

[0128] Step 5: Using a tower crane near the installation side, install the connecting beam 52. After installation, weld the main welds between the first arch segment 512 and the support segment 511 of the rear arch 5b and the front arch 5a. Use an operating platform for installation and welding. (See attached instructions.) Figure 25 As shown.

[0129] Step six: Repeat steps two through five, installing the first arch segment on the opposite side using the same method. See [link / reference]. Figure 26 As shown.

[0130] Step 7: Use the second truck crane 16, repeat Steps 2 to 6 to install the second arch segment 513 on the first arch segment 512, weld the second temporary rigid diagonal rod 17 between the second arch segment 513 and the arch area main column 11. After welding is completed, remove the wire rope of the arch segment adjusting device on the first arch segment 512, retain the first temporary rigid diagonal rod 15, and hang a horizontal net under the floor beam 3 of the first-floor arch area to prevent high-altitude falls. Refer to Figure 27 as shown.

[0131] Step 8: Use the third truck crane 22, repeat Steps 2 to 6 to install the third arch segment 514 on the second arch segment 513, and adjust the pre-elevation to the same height when the arch segment is in place according to the deformation height of the arch segment calculated by simulation to ensure that the welded arch segment meets the design accuracy; in this embodiment, it is 5 mm.

[0132] Weld the third temporary rigid diagonal rod 18 between the third arch segment 514 and the arch area main column 11. At least 1 / 5 of the main weld length needs to be welded before the hook of the truck crane is removed for this section of the arch, and continue welding after the hook is removed. After welding is completed, remove the wire rope of the arch segment adjusting device on the second arch segment 513, and retain the third temporary rigid diagonal rod 18. Refer to Figure 28 as shown.

[0133] Step 9: Install the closure segment 515 of the arch segment. Measure the actual size of the closure segment in advance, review the component size, weld the two adjacent arch segments in the front and back rows in sequence. After all welding work is completed, conduct an acceptance inspection of the arch segment. When reviewing the component size again, if the component length is too long, it can be appropriately trimmed with a grinder to ensure that the closure segment can be smoothly installed. Only after adjusting the arch attitude and positioning size can welding be carried out. The bottom flange of the arch segment uses an overhead welding seam to avoid opening manholes and increasing the welding workload. Refer to Figure 29 as shown.

[0134] Step 10: After the arch segment passes the acceptance inspection, remove the wire rope of the arch segment adjusting device on the third arch segment 514 and the first, second, and third temporary rigid diagonal rods. The specific positions are shown in Figure 12 as shown. During the removal process, do a good job in deformation monitoring, compare the deformation data with the construction simulation data, and carry out the next process installation if it meets the design requirements; according to the calculation, after removing the temporary rigid diagonal rod, the main arch deformation less than 1 mm is qualified.

[0135] Step 11: Use the fourth truck crane 19 to install the suspension columns 10 of the rear row arch, and use a suspension cage or a boom lift as the operating platform; according to the construction simulation, the influence of sequentially installing two suspension columns under the arch on the arch deformation is less than 1 mm. For the convenience of construction, first install the suspension column 101 under the arch within the rear row arch surface, and then install the suspension column 101 under the arch within the front row arch surface to ensure that the influence on the arch deformation is less than 1 mm. Refer to Figure 30 as shown.

[0136] Step 12: Using the fourth truck crane 19, install the main beams 31 of the second-floor arch area of ​​the rear arch section from both ends toward the middle. After installation, perform overall alignment and welding from the middle section toward both ends. See [link / reference]. Figure 31 As shown.

[0137] Step thirteen: Using the fourth truck crane 19, install the bottom section 103 of the rear arch section, see [link / reference]. Figure 32 As shown.

[0138] Step fourteen: Using the fourth truck crane 19, install the main floor beam 41 in the non-arch area below the rear arch; after installation, perform overall alignment and welding from the middle section towards both ends, see [link to relevant documentation]. Figure 33 As shown.

[0139] Step 15: Using the fourth truck crane 19, install the main beams 31 of the arch area floor between the arch-supported columns in the rear arch surface sequentially from bottom to top. (See below) Figure 34 As shown.

[0140] Step sixteen: Install the under-arch support column 101 of the front arch and the main floor beam 31 of the arch area between the under-arch support column using the same installation method as the rear arch. See [link / reference]. Figure 35 As shown.

[0141] Step 17: Install the secondary beam 42 of the non-arched floor slab on the first floor using a tower crane. (See attached image) Figure 36 As shown.

[0142] Step 18: Using a tower crane or truck crane, install all remaining second-floor arched section floor beams 3 and non-arched section floor beams 4. See [link / reference]. Figure 37 As shown.

[0143] Step nineteen, repeating step eighteen, uses a tower crane or truck crane to install all remaining third and fourth floor arched zone floor beams 3 and non-arched zone floor beams 4, see [link / reference]. Figure 38 As shown.

[0144] Step 20: Using a tower crane or truck crane, install all remaining five-story arched floor beams 3, non-arched floor beams 4, and arch-mounted columns 102. See [link / reference needed]. Figure 39 As shown.

[0145] Step 21: Using a tower crane or truck crane, install all the floor beams 3 in the six-story arched area and the floor beams 4 in the non-arched area. The internal steel structure installation is now complete. See [link / reference]. Figure 40 As shown.

[0146] Step 22: Lay floor slabs on the floor beams from the ground floor upwards, and pour floor slab concrete. The construction of the building within the C-shaped space is now complete.

[0147] In step two, see Figure 13-17As shown, the temporary arch segment assembly device 6 is installed on the arch column segment, which includes a support segment 511 and a first arch segment 512. The arch column segment includes a positioning plate 61, splicing ear plate 62, fixing clamp 63, and fixing bolts 64. The splicing positions are defined as the lower and upper sides based on the elevation. The first arch segment 512 has two layers of connecting brackets connecting the arch area floor beams 3, namely an upper bracket 311 and a lower bracket 312, corresponding to the two layers of main structural floor beams 20. The temporary arch segment assembly device 6 is located below the main structural floor beam 20 corresponding to the lower bracket 312.

[0148] See Figure 18-19 As shown, the positioning plates 61 are diagonally symmetrically arranged on the upper and lower sides of the splicing position. They include a lower positioning plate 611 arranged on the lower side of the top end of the support section 511 and an upper positioning plate 612 arranged on the upper side of the bottom end of the first arch section 512. Half of the positioning plate 61 is fixedly connected to the arch column section, and the other half extends out of the arch column section and into the splicing position. The bottom end of the first arch section 512 is respectively locked and limited on the top end of the support section 511 on the upper and lower sides of the splicing position by the positioning plates 61, so that the bottom surface of the first arch section 512 is in contact with the top surface of the support section 511. The positioning plate 61 forms a vertical limiting member.

[0149] In this embodiment, two lower positioning plates 611 are symmetrically arranged on the support section 511 around the column axis of the arched steel member 51. The lower half of the lower positioning plate 611 is fixedly connected to the support section 511, and the upper half of the lower positioning plate 611 extends out of the splicing position. Two upper positioning plates 612 are symmetrically arranged on the first arch section 512 around the column axis of the arched column section. The upper half of the upper positioning plate 612 is fixedly connected to the first arch section 512, and the lower half of the upper positioning plate 612 extends out of the splicing position.

[0150] The splicing ear plate 62 includes a lower splicing ear plate 621 provided on both the upper and lower sides of the top end side of the support section 511, and an upper splicing ear plate 622 provided on both the upper and lower sides of the bottom end side of the first arch section 512. The lower splicing ear plate 621 and the upper splicing ear plate 622 are paired at the splicing position and located in the same vertical plane. The splicing ear plate 62 has a splicing ear plate hole 623.

[0151] In this embodiment, the splicing ear plates 62 are symmetrically arranged on the left and right sides of the arch column axis and located outside the positioning plate. Two upper splicing ear plates 622 are provided on each side, and two lower splicing ear plates 621 are provided on each side. The bottom of the upper splicing ear plate 622 is higher than the bottom end face of the first arch section 512, and the top of the lower splicing ear plate 621 is lower than the top end face of the support section 511. Three splicing ear plate holes 623 are vertically spaced on both the upper and lower splicing ear plates 622 and 621.

[0152] The fixing clamp 63 cooperates with each pair of splicing ear plates 62 and is clamped on both sides of each pair of splicing ear plates 62. The upper splicing ear plate 622 is clamped at the top of the fixing clamp 63, and the lower splicing ear plate 621 is clamped at the bottom of the fixing clamp 63. The fixing clamp 63 has a fixing clamp hole 631 corresponding to the splicing ear plate hole 623. The fixing clamp hole 631 and the splicing ear plate hole 623 are anchored by fixing bolts 64.

[0153] The fixing clamp 63 includes an inner plate 632 disposed inside the splicing ear plate 62 and an outer plate 633 disposed outside the splicing ear plate 62. The inner plate 632 is pre-connected to the splicing ear plate 62, and the inner plate 632 forms a left and right limiting member. The width of the fixing clamp 63 is smaller than the width of the splicing ear plate 62, and the outer edges of both are flush.

[0154] In this embodiment, the arch section adjustment device 7 is located above the main structural floor beam 20 corresponding to the upper corbel 311. Workers stand on the main structural floor beam 20 and adjust the installation angle and posture of the first arch section 512 using the arch section adjustment device 7. The arch section adjustment device 7, the structural lifting lug 8 of the main column 11 in the arch area, and the adjusting lifting lug 9 of the first arch section 512 are all located above the main structural floor beam 20. The arch section adjustment device 7 includes a chain hoist 71, a main lifting wire rope 72, an adjusting wire rope 73, and a safety rope 74. One end of the main lifting wire rope 72 is connected to the structural lifting lug 8, and the other end is connected to the chain hoist 71. One end of the adjusting wire rope 73 is connected to the adjusting lifting lug 9, and the other end is connected to the chain hoist 71. The chain hoist 71 is located above the main structural floor beam 20 and is adjusted by the worker pulling it. One end of the safety rope 74 is fixedly connected to the main lifting wire rope 72, and the other end is fixedly connected to the adjusting lifting lug 9.

[0155] The specifications and models of the lifting lugs, wire ropes, chain hoists, etc. involved in this invention all need to be determined by calculation. Among them, the temporary rigid diagonal bars are made of steel of not less than H200. The first truck crane 14 has a capacity of 130 tons, the second truck crane 16 has a capacity of 260 tons, the third truck crane 22 has a capacity of 350 tons, and the fourth truck crane 19 has a capacity of 50 tons.

[0156] After adopting the temporary arch segment assembly device 6 and the arch segment adjustment device 7, step two is divided into the following steps for construction:

[0157] Step a, see Figure 17-19 As shown, the lower splicing ear plate 621 and the lower positioning plate 611 are pre-fixed to the predetermined position of the support section 511; the upper splicing ear plate 622 and the upper positioning plate 612 are pre-fixed to the predetermined position of the first arch section 512; and then the inner plate 632 is temporarily connected to the upper splicing ear plate 622 in advance by fixing bolts 64.

[0158] Step b: The first arch segment 512 is lifted to the connection position, and then the arch segment adjustment device 7 is pre-connected to the first arch segment 512.

[0159] Step c: Workers climb onto the main structure floor beams to operate the arch section adjustment device. The crane gradually lifts the first arch section 512 to the predetermined position, and then the temporary arch column splicing device is assembled and connected in place. The inner plate 632 acts as a horizontal limiting component to restrict the horizontal position of the first arch section 512, and the positioning plates on the upper and lower sides act as vertical limiting components to restrict the vertical position of the first arch section 512. The connection is completed in one go. During this process, workers assist in the installation posture and angle of the arch column by operating the arch section adjustment device.

[0160] Step d, see Figure 20-21 As shown, after the adjustment is completed, the workers use the ladder set on the back side of the arch column to climb to the position, splice the outer plate 633 of the fixing plate 63 into place, and then tighten all the fixing bolts.

[0161] Step e: Connect the first temporary rigid diagonal brace between the first arch segment 512 and the main column 11 of the arch area, and then remove the arch segment adjustment device.

[0162] In this invention, in steps eleven, thirteen, and sixteen, the cross-section of the under-arch suspended column is 380mm × 24mm, with a maximum length of 18.5m, and it is connected to the arch component by a pin. Due to the large cross-section of the arch beam, the installation of the suspended column is difficult. A relay hoisting technique is used on-site to meet the construction needs. First, a prefabricated hoisting cage is hung at the installation node of the suspended column to meet the needs of personnel operation and ensure the safety of operators. Hoisting lugs are set on all four sides of the suspended column. First, two hoisting lugs along the direction of the arch beam are used to make the hoisting vertical and hoist it below the installation position. On the arch beam, two hoisting lugs perpendicular to the direction of the arch beam are hoisted using a chain hoist and safety rope. After the chain hoist is tensioned, the hoisting machinery slowly releases the hook until it is no longer under pressure, and then the sling is released. The chain hoist is slowly tensioned to accurately adjust the position of the suspended column and install the pin.

Claims

1. An arched structure inside a steel frame, characterized in that: It includes a main building steel frame and an internal steel structure. The front center of the main building steel frame is recessed to form a C-shaped space (21). The edge structure of the main building steel frame on three sides of the C-shaped space (21) includes a vertical edge steel frame that encloses three sides. The internal steel structure is set in the C-shaped space (21) and is fixedly connected to the vertical edge steel frame through a floor horizontal beam structure. The vertical edge steel frame includes side frames (1) located opposite each other on the left and right sides of the internal steel structure and a back frame (2) located on the back side of the internal steel structure. Each edge steel frame includes frame columns and frame beams arranged in layers between the fixedly connected frame columns. The frame columns stand on the ground. The area where the first two rows of frame columns of the side frame (1) are located is the arch area. These two rows of frame columns are the main columns (11) of the arch area. The frame beams between the main columns (11) of the arch area of ​​the same side frame (1) are the main beams (12) of the arch area. The area between the arch area and the back frame (2) is the non-arch area. The frame columns of the back frame (2) are the main columns (201) of the non-arch area. The frame beams between the main columns (201) of the non-arch area are the main beams (202) of the non-arch area. The frame beams between the main columns (11) of the arch area and the main columns (201) of the non-arch area are the main beams (13) of the interval. The floor horizontal beam structure is arranged in layers at intervals along the height direction of the frame columns and corresponding to the positions of each frame beam. Each layer includes arched floor beams (3) and non-arched floor beams (4). The arched floor beam (3) includes an arched floor main beam (31) and an arched floor secondary beam (32). The two ends of the arched floor main beam (31) are respectively fixedly connected between the arched floor main columns (11) that are set opposite to each other on the left and right sides of the frame (1). The arched floor secondary beam (32) is vertically spaced between the two arched floor main beams (31) on the same floor. The two ends of the arched floor secondary beam (32) are respectively fixedly connected between the arched floor main beams (31) on the same floor. The non-arched floor beam (4) includes a non-arched floor secondary beam (42), which is perpendicular to the arched floor main beam (31). The two ends of the non-arched floor secondary beam (42) are fixedly connected between the arched floor main beam (31) and the non-arched floor main beam (202) in the back row. The internal steel structure includes an arched structure (5) and an arched suspension structure. The arch structure (5) includes two arch steel members (51) arranged in parallel front and rear and a connecting beam (52). The distance between the two arch steel members (51) is equal to the distance between the main columns (11) of the arch area. Each arch steel member (51) corresponds to the corresponding main column (11) of the arch area and is located in the same vertical plane. This vertical plane is the arch surface. The arch steel members (51) are interspersed in the horizontal beam structure of each floor in each arch surface. The steel components through which the arch steel members (51) pass are all cut off and fixedly connected to the arch steel members (51). The arch steel members (51) extend out of the side frame (1) at both ends. The extension position is the top of the support section (511) of the arch steel members (51). The bottom end of the support section (511) is inclined to the ground. The connecting beam (52) is located between two arched steel members (51) and is used to fix the two arched steel members (51) together. The connecting beam (52) is set at intervals along the arc of the arched steel members (51). The setting position of the connecting beam (52) corresponds to the position of the floor beam (3) of each arched area. The connecting beam (52) is an additional secondary beam (32) of the floor of the arched area. The rear end of the connecting beam (52) extends backward and is fixedly connected to the back frame (2). The connection position is located on the main beam (202) of the non-arched area and / or on the beam-column connection node between the main beam (202) of the non-arched area and the main column (201) of the non-arched area. The extended part is an additional secondary beam (42) of the floor of the non-arched area. The arch area suspension structure includes a hanging column (10). The hanging column (10) is vertically and continuously set between the floor beam (3) of the bottom arch area and the floor beam (3) of the top arch area. The hanging column (10) is located in the arch surface and is symmetrically set on both sides with the apex of the arch steel member (51) as the boundary. The hanging column (10) is inserted and fixedly connected to the connection node of the secondary beam (32) of the arch area floor and the main beam (31) of the arch area floor in the horizontal beam structure of each floor. Each hanging column (10) includes an under-arch hanging column (101) located on the lower side of the arch steel member (51) and an upper-arch hanging column (102) located on the upper side of the arch steel member (51) as the boundary. The hanging column (10) and the arch steel member (51) are all pin connected.

2. The arched structure inside the steel frame according to claim 1, characterized in that: The main beams (12) of the arch area are all provided with figure-eight reinforcing diagonal braces (121); the floor beams (3) of the arch area also include groups of cross reinforcing diagonal braces (33), and every three secondary floor beams (32) of the arch area are set as a unit.

3. The arched structure inside the steel frame according to claim 1 or 2, characterized in that: The non-arched floor beam (4) is set one more floor below the arched floor beam (3) to form the non-arched floor beam (4) of the first floor, including two rows of non-arched floor main beams (41) of the first floor. The front row of non-arched floor main beams (41) is set directly below the arched floor main beam (31) of the second floor, and the rear row of non-arched floor main beams (41) is set directly below the non-arched floor main beam (202) of the second floor. There are also non-arched floor secondary beams (42) between the front row of non-arched floor main beams (41) and the rear row of non-arched floor main beams (41). The arched steel component (51) is divided into a front arch (5a) and a rear arch (5b). The hanging column (10) of the rear arch (5b) extends downward to form the bottom section (103) of the interval. The two ends of the bottom section (103) are respectively fixedly connected between the main beam (31) of the arch area floor of the second floor and the main beam (41) of the non-arch area floor of the front row. The elevation of the arched floor beam (3) on the second floor is located at the top of the support section (511).

4. A flexible back-pull relay hoisting construction method for an arched structure inside a steel frame according to claim 3, characterized in that, The construction steps are as follows: Step 1: Construct the main building steel frame, including the vertical edge steel frames on three sides, and simultaneously complete the pouring of concrete for each floor slab and reach the design strength to meet the installation conditions of the steel structure in the C-shaped space. Among them, the support section (511) and the main column (11) of the arch area are constructed as a whole. Step 2: Use the first truck crane (14) to lift the first arch section (512) of the rear arch before lifting. Before lifting, install safety poles, fall arrestors, or ladders on the upper surface of the first arch section (512) of the rear arch. Temporarily fix and splice the first arch section (512) and the support section (511) using the temporary arch section splicing device (6) of the temporary fixing structure. Then, adjust the installation position of the first arch section (512) and the support section (511) using the arch section adjustment device (7) of the temporary fixing structure. Unhook the crane when the conditions for unhooking are met. Step 3: Weld the first temporary rigid diagonal brace (15) between the first arch section and the main column (11) of the arch area to constrain the in-plane welding deformation of the arch steel member (51); Step four: Repeat steps two and three to install the first arch section of the front row of arches; Step 5: Use a tower crane close to the installation side to install the connecting beam (52). After installation, weld the main welds of the first arch section (512) and the support section (511) in the rear arch (5b) and the front arch (5a). Step six: Repeat steps two through five to install the first arch segment on the opposite side using the same method; Step 7: Using the second truck crane (16), repeat steps 2 to 6 to install the second arch section (513) on the first arch section (512). Weld the second temporary rigid diagonal bar (17) between the second arch section (513) and the main column (11) of the arch area. After welding, remove the wire rope of the arch section adjustment device on the first arch section (512), retain the first temporary rigid diagonal bar (15), and hang a horizontal net below the floor beam (3) of the first floor arch area to prevent falling from height. Step 8: Using a third truck crane (22), repeat steps 2 to 6 to install the third arch section (514) on the second arch section (513). According to the arch section deformation height calculated by simulation, adjust the pre-lift height of the arch section when it is in place to ensure that the welded arch section meets the design accuracy. Weld a third temporary rigid diagonal bar (18) between the third arch section (514) and the main column (11) of the arch area. Before the truck crane is unhooked, the main weld of this arch section needs to be completed for at least 1 / 5 of its length. After unhooking, continue welding. After welding is completed, remove the wire rope of the arch section adjustment device on the second arch section (513) and retain the third temporary rigid diagonal bar (18). Step 9: Install the closing section (515) of the arch segment. Measure the actual size of the closing section in advance, verify the component size, and weld the two arch segments in the front and back rows in sequence. After all welding work is completed, the arch segment is inspected. Step 10: After the arch section passes the acceptance test, remove the steel wire rope of the upper arch section adjustment device of the third arch section (514) and the first, second and third temporary rigid diagonal bars. During the removal process, perform deformation monitoring and compare the deformation data with the construction simulation data. If the design requirements are met, proceed to the next installation process. According to the calculation, after removing the temporary rigid diagonal bars, the main arch deformation is less than 1mm to be considered qualified. Step 11: Use the fourth truck crane (19) to install the hanging column (10) of the rear arch, and use a cage or aerial work platform as the operating platform; according to the construction simulation, first install the under-arch hanging column (101) in the rear arch surface, and then install the under-arch hanging column (101) in the front arch surface, which will have less than 1mm of impact on arch deformation. Step 12: Using the fourth truck crane (19), install the main beam (31) of the arch area floor of the second floor of the rear arch from the two sections to the middle. After the installation is completed, the whole structure is corrected and welded from the middle section to both ends. Step thirteen: Use the fourth truck crane (19) to install the bottom section (103) of the rear arch section. Step fourteen: Use the fourth truck crane (19) to install the main beam (41) of the non-arch area floor below the rear arch; after installation, make overall corrections and weld from the middle section to both ends; Step 15: Using the fourth truck crane (19), install the main beams (31) of the arch area floor between the arch under the hanging columns in the rear arch surface from bottom to top. Step 16: Install the under-arch support column (101) of the front arch and the main floor beam (31) of the arch area between the under-arch support column using the same installation method as the rear arch. Step 17: Use a tower crane to install the secondary beams (42) of the non-arched area of ​​the first floor. Step 18: Use a tower crane or truck crane to install all the remaining arched floor beams (3) and non-arched floor beams (4) on the second floor. Step 19: Repeat step 18 and use a tower crane or truck crane to install all the remaining third and fourth floor arch beams (3) and non-arch floor beams (4). Step 20: Use a tower crane or truck crane to install all the remaining five-story arched floor beams (3), non-arched floor beams (4), and arch-mounted columns (102). Step 21: Using a tower crane or truck crane, install all the floor beams (3) of the six-story arched area and the floor beams (4) of the non-arched area, and the internal steel structure installation is completed; Step 22: Lay floor slabs on the floor beams from the ground floor upwards, and pour floor slab concrete. The construction of the building within the C-shaped space is now complete.

5. The flexible back-tension relay hoisting construction method for the internal arched structure of the steel frame according to claim 4, characterized in that: In step two, the temporary arch segment splicing device (6) is set on the arch column segment, which includes a support segment (511) and a first arch segment (512). The device includes a positioning plate (61), splicing ear plate (62), fixing clamp (63), and fixing bolts (64). The splicing positions are defined as the lower side and the upper side based on the elevation. The positioning plates (61) are symmetrically arranged diagonally on the upper and lower sides of the splicing position, including a lower positioning plate (611) set on the lower side of the top end of the support section (511) and an upper positioning plate (612) set on the upper side of the bottom end of the first arch section (512). Half of the positioning plate (61) is fixedly connected to the arch column section, and the other half extends out of the arch column section and into the splicing position. The bottom end of the first arch section (512) is respectively locked and limited on the top end of the support section (511) by the positioning plates (61) on the upper and lower sides of the splicing position, so that the bottom surface of the first arch section (512) is in contact with the top surface of the support section (511). The positioning plate (61) forms a vertical limiting member. The splicing ear plate (62) includes a lower splicing ear plate (621) provided on both the upper and lower sides of the top side of the support section (511) and an upper splicing ear plate (622) provided on both the upper and lower sides of the bottom side of the first arch section (512). The lower splicing ear plate (621) and the upper splicing ear plate (622) are paired at the splicing position and located in the same vertical plane. The splicing ear plate (62) has a splicing ear plate hole (623). The fixing clamp (63) cooperates with each pair of splicing ear plates (62) and is clamped on both sides of each pair of splicing ear plates (62). The upper splicing ear plate (622) is clamped at the top of the fixing clamp (63), and the lower splicing ear plate (621) is clamped at the bottom of the fixing clamp (63). The fixing clamp (63) has a fixing clamp hole (631) corresponding to the splicing ear plate hole (623). The fixing clamp hole (631) and the splicing ear plate hole (623) are anchored by fixing bolts (64).

6. The flexible back-pull relay hoisting construction method for the internal arched structure of the steel frame according to claim 5, characterized in that: Workers stand on the main structural floor beam (20) of the completed main building steel frame and adjust the installation angle and posture of the first arch section (512) using the arch section adjustment device (7). The arch section adjustment device (7), the structural lifting lugs (8) of the main column (11) in the arch area, and the adjustment lugs (9) of the first arch section (512) are all located above the position of the main structural floor beam (20) of the main building steel frame. The arch section adjustment device (7) includes a chain hoist (71), a main hoisting wire rope (72), an adjustment wire rope (73), and a safety device. The main hoisting wire rope (72) is connected to the structural lifting lug (8) at one end and to the chain hoist (71) at the other end. The adjusting wire rope (73) is connected to the adjusting lug (9) at one end and to the chain hoist (71) at the other end. The chain hoist (71) is located above the main structural floor beam (20) and is adjusted by workers pulling it. The safety rope (74) is fixedly connected to the main hoisting wire rope (72) at one end and to the adjusting lug (9) at the other end.

7. The flexible back-tension relay hoisting construction method for the internal arched structure of the steel frame according to claim 6, characterized in that: The first arch section (512) is provided with two layers of connecting brackets that connect the floor beams (3) of the arch area, namely the upper bracket (311) and the lower bracket (312), which correspond to the two layers of main structure floor beams (20). The temporary arch assembly device (6) is located below the main structural floor beam (20) corresponding to the lower corbel (312); The arch section adjustment device (7) is located above the main structure floor beam (20) corresponding to the upper corbel (311).

8. The flexible back-pull relay hoisting construction method for the internal arched structure of the steel frame according to claim 6, characterized in that: Two lower positioning plates (611) are symmetrically arranged on the support section (511) along the column axis of the arched steel member (51). The lower half of the lower positioning plate (611) is fixedly connected to the support section (511), and the upper half of the lower positioning plate (611) extends out of the splicing position. The upper positioning plate (612) is provided in two symmetrical positions on the first arch section (512) to be installed, with the upper half of the upper positioning plate (612) fixedly connected to the first arch section (512) to be installed, and the lower half of the upper positioning plate (612) extends out of the splicing position. The splicing ear plates (62) are symmetrically arranged on the left and right sides of the column axis of the arch column section and located on the outside of the positioning plate. There are two splicing ear plates (622) on each side of the upper section and two splicing ear plates (621) on each side of the lower section. The bottom of the upper splicing ear plate (622) is higher than the bottom end face of the first arch section (512), and the top of the lower splicing ear plate (621) is lower than the top end face of the support section (511). The splicing ear plate holes (623) are vertically spaced at no less than three on both the upper splicing ear plate (622) and the lower splicing ear plate (621). The fixing clamp (63) includes an inner plate (632) disposed inside the splicing ear plate (62) and an outer plate (633) disposed outside the splicing ear plate (62). The inner plate (632) is pre-connected to the splicing ear plate (62) and forms a left and right limiting member. The width of the fixed clamp (63) is smaller than the width of the splicing ear plate (62), and the outer edges of the two are flush.

9. The flexible back-tension relay hoisting construction method for the internal arched structure of a steel frame according to any one of claims 5-8, characterized in that: Step two consists of the following steps: Step a: Pre-fix the lower splicing ear plate (621) and the lower side positioning plate (611) to the predetermined position of the support section (511); pre-fix the upper splicing ear plate (622) and the upper side positioning plate (612) to the predetermined position of the first arch section (512); then temporarily connect the inner plate (632) to the upper splicing ear plate (622) in advance with fixing bolts (64); Step b, the first arch segment (512) is lifted to the connection position, and then the arch segment adjustment device (7) is pre-connected to the first arch segment (512); Step c: Workers climb onto the floor beam of the main structure to operate the arch section adjustment device. The crane gradually lifts the first arch section (512) to the predetermined position, and then the temporary splicing device of the arch column is spliced ​​and connected in place. The inner plate (632) serves as a horizontal limiting component to restrict the horizontal position of the first arch section (512), and the positioning plates on the upper and lower sides serve as vertical limiting components to restrict the vertical position of the first arch section (512). The connection is completed in one go. During this process, workers assist in the installation posture and angle of the arch column by operating the arch section adjustment device. Step d: After the adjustment is completed, the worker climbs to the position using the ladder set on the back side of the arch column section, splices the outer plate (633) of the fixing clamp (63) into place, and then tightens all the fixing bolts. Step e: Connect the first temporary rigid diagonal brace between the first arch segment (512) and the main column (11) of the arch area, and then remove the arch segment adjustment device.

Images