Construction method and device for large-span prestressed arch roof structure

Abstract

The application relates to the technical field of building construction, and provides a large-span prestressed vault structure construction method and device, which comprises the following steps: dividing a vault structure to be constructed into a plurality of sliding assembly units along a sliding direction; installing sliding rails at two ends of the vault structure; installing a sliding trolley at a starting section of the sliding rails; installing a sliding seat connected with a beam base and an upper section steel column of one sliding assembly unit on the sliding trolley; erecting a support jig frame, assembling an arch beam of the sliding assembly unit, and connecting the arch beam with the beam bases at two ends of the arch beam; installing and tensioning a steel strand; moving the sliding trolley to a target position of the sliding assembly unit on the sliding rails by using a traction device; repeating the above steps until all the sliding assembly units of the vault structure are installed; and removing the support jig frame, the prestressed tensioning steel strand and the sliding rails. The application accelerates construction progress, saves social resources and reduces engineering cost.

Description

Construction methods and devices for large-span prestressed arch structures Technical Field

[0001] This invention belongs to the field of building construction technology, specifically relating to a construction method and apparatus for a large-span prestressed arch structure. Background Technology

[0002] The application of high-performance steel and CAE technology in the construction industry has promoted the design and application of long-span structures. With the increasing maturity of long-span structure construction techniques, the choice of construction methods has become a crucial factor restricting the construction period and cost of long-span structures. As a vital technology determining the construction quality and safety of long-span structures, the research and innovation of long-span construction technology is an inevitable requirement for the development of building construction.

[0003] With continuous improvements and developments in construction technology and rising demands for architectural aesthetics, the use of steel structures in large-span and super high-rise structures is indispensable, highlighting their crucial role in the construction industry. When the span of a steel structure exceeds 50 meters, it can be considered a large-span steel structure. In the past, temporary supports were commonly erected for the construction of large-span steel structures. However, this method has several drawbacks: the erection and dismantling of temporary supports are inefficient and time-consuming, impacting the construction schedule. Furthermore, erecting supports significantly affects the underlying concrete structure and consumes substantial amounts of materials, labor, and machinery. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings of the prior art and propose a construction method and device for large-span prestressed arch structures, which solves the problems of long construction period, large amount of materials used, and great impact on the lower concrete structure in existing large-span steel structure construction methods.

[0005] In a first aspect, the present invention provides a construction method for a large-span prestressed arch structure, comprising the following steps:

[0006] Step 1: Based on the construction drawings of the arch structure, determine the sliding direction of the arch structure and divide the arch structure to be constructed into several sliding assembly units along the sliding direction; each sliding assembly unit includes several arch beams distributed along the sliding direction, beam bases set at both ends of the arch beams, upper steel columns set at the bottom of the beam bases, and lower steel columns set at the bottom of the upper steel columns.

[0007] Step 2: Based on the construction location of the arch structure, construct several lower steel columns distributed along the sliding direction at both ends of the arch structure;

[0008] Step 3: Install the sliding rails on both sides of the lower steel columns at both ends of the arch structure; the length of the sliding rails is arranged along the sliding direction;

[0009] Step 4: Install the sliding trolley on the starting section of the sliding track;

[0010] Step 5: Install the sliding seat of a sliding assembly unit, which connects the beam base and the upper steel column, onto the sliding trolley;

[0011] Step 6: Erect a support frame, assemble the arch beam of the sliding assembly unit, and connect the arch beam to the beam base at both ends;

[0012] Step 7: Install and tension the prestressed steel strands of the sliding assembly unit;

[0013] Step 8: Separate the top of the support frame from the sliding assembly unit, use the traction device to pull the sliding trolley to move on the sliding track to the target position of the sliding assembly unit, and connect the upper and lower steel columns of the sliding assembly unit.

[0014] Step 9: Repeat steps 4 to 8 above to install the next sliding assembly unit; until all sliding assembly units of the arch structure are installed.

[0015] Step 10: Remove the support frame, prestressed tensioned steel strands, and sliding track.

[0016] Further, step 5 includes:

[0017] Step 51: Connect multiple beam legs along the length of the beam base to connect one by one with the multiple arch beams of the sliding assembly unit;

[0018] Step 52: Weld and fix multiple upper steel columns of the sliding assembly unit to the bottom end of the beam base. The spacing and number of the multiple upper steel columns of the sliding assembly unit correspond one-to-one with the spacing and number of the multiple lower steel columns of the sliding assembly unit.

[0019] Step 53: Install the sliding seat on both sides of the upper steel column below the beam base; the sliding seat includes a plurality of first brackets arranged along the length direction of the beam base and a support member arranged at the lower end of each first bracket, the first brackets being connected to the upper steel column.

[0020] Step 54: Install the sliding seat that connects the beam base and the upper steel column onto the sliding trolley.

[0021] Further, step 6 includes:

[0022] Step 61: Divide the arch beam of each sliding assembly unit into a first segment, a second segment, and a third segment along its length; the second segment is higher than the first and third segments;

[0023] Step 62: Erect a support frame to support the second segment of each arch beam;

[0024] Step 63: First, install the second segment of an arch beam on the support frame, then install the first and third segments of the arch beam, and then weld and fix the far ends of the first and third segments to the beam bases at both ends of the arch beam.

[0025] Step 64: Repeat step 63 above to install the next adjacent arch beam until all arch beams of the sliding assembly unit are installed.

[0026] Step 65: Connect the adjacent arch beams of the sliding assembly unit using crossbeams.

[0027] Further, step 7 includes:

[0028] Step 71: Arrange the two sets of tensioned steel strands symmetrically on both sides of each arch beam of the sliding assembly unit;

[0029] Step 72: Perform tensioning operations in stages and symmetrically until the tension reaches the design value and forms the final stable state.

[0030] Furthermore, step 8, which involves using a traction device to move the sliding trolley on the sliding track to the target position of the sliding assembly unit, includes: connecting the traction device to the sliding trolley and simultaneously pulling the sliding trolleys at both ends of the sliding assembly unit along the sliding direction, so that the multiple upper steel columns of the sliding assembly unit are positioned one-to-one above the multiple lower steel columns of the sliding assembly unit.

[0031] Secondly, the present invention also proposes a construction device for a large-span prestressed arch structure, wherein the arch structure is divided into several sliding assembly units along the sliding direction; each sliding assembly unit includes several arch beams distributed along the sliding direction, beam bases set at both ends of the arch beams, an upper steel column set at the bottom end of the beam base, and a lower steel column set at the bottom end of the upper steel column; the construction device includes:

[0032] Two sets of sliding tracks are set at both ends of the arch structure to be constructed; the length of the sliding tracks is arranged along the sliding direction;

[0033] Several sliding components are installed one by one on the starting section of the sliding track to support the arch beam, beam base and upper steel column of each sliding assembly unit, and to move the sliding assembly unit of the starting section to the target position of the sliding assembly unit.

[0034] A support frame, positioned between the initial sections of the two sets of sliding tracks, is used for supporting and unloading each sliding assembly unit of the initial section; and

[0035] Several sets of prestressed tensioned steel strands are symmetrically arranged on both sides of each arch beam of the sliding assembly unit.

[0036] Furthermore, the sliding component includes:

[0037] A sliding trolley is installed on the sliding track;

[0038] A sliding seat, mounted on the sliding trolley, connects the beam base of the sliding assembly unit and the upper steel column; the beam base connects the arch beam of the sliding assembly unit; and

[0039] A traction device, connected to a sliding trolley, is used to move the sliding trolley on the sliding track to the target position of the sliding assembly unit.

[0040] Furthermore, the sliding seat includes a plurality of first brackets arranged along the length direction of the beam base and a support member disposed at the lower end of each first bracket; the support member is disposed on the sliding trolley; the first brackets are connected to the upper steel column.

[0041] Furthermore, limit plates are provided on both sides of the sliding track, and the sliding trolley is located between the limit plates on both sides of the sliding track.

[0042] By setting limit plates on both sides of the sliding track, the movement path of the sliding trolley is restricted, ensuring the correct sliding direction of the sliding assembly unit and guaranteeing construction quality.

[0043] Furthermore, the construction device also includes several second brackets, which are connected to both sides of the lower steel column; the sliding rail is installed on the second brackets.

[0044] The beneficial effects of this invention include: by dividing the arch structure into several sliding assembly units along the sliding direction, and setting up sliding tracks and sliding trolleys, each sliding assembly unit is mounted on its two ends on the sliding trolley, and a traction device is used to pull the sliding assembly unit to its target position, thus realizing the sliding construction of large-span prestressed arch structures. Furthermore, during construction, there is no need for extensive erection and dismantling of support frames; support frames only need to be erected and dismantled at the starting position before the sliding assembly unit slides, greatly reducing the amount of temporary support materials used. This effectively solves many problems associated with large-span structures, such as long construction periods, large quantities of temporary support materials, and significant impact on the underlying concrete structure. It accelerates construction progress, saves social resources, reduces project costs, enhances the company's ability to fulfill contracts, provides a guarantee for the construction of large-span prestressed arch structures, and has good reference and promotion value for similar projects. Attached Figure Description

[0045] Figure 1 is a schematic flowchart of the construction method for the large-span prestressed arch structure of the present invention.

[0046] Figure 2 is a schematic diagram of the construction of the lower steel column and supporting frame of the large-span prestressed arch structure construction method of the present invention.

[0047] Figure 3 is a schematic diagram of the sliding rail installed on the lower section of the steel column in Figure 2.

[0048] Figure 4 is a schematic diagram of a sliding seat connected to the beam base and the upper steel column installed on the sliding track of Figure 3.

[0049] Figure 5 is a schematic diagram of the second segment of an arch beam on the support frame of Figure 4, on which a sliding assembly unit is installed.

[0050] Figure 6 shows schematic diagrams of the first and third stages of installation of the arch beam in Figure 5.

[0051] Figure 7 is a schematic diagram showing the complete installation of all the arch beams of the sliding assembly unit in Figure 6.

[0052] Figure 8 is a schematic diagram of the sliding assembly unit in Figure 7 after the prestressed tensioned steel strands are installed.

[0053] Figure 9 is a schematic diagram showing the top of the support frame in Figure 8 separated from the sliding assembly unit.

[0054] Figure 10 is a schematic diagram of the sliding assembly unit in Figure 9 after it has moved from the starting section of the sliding track to the target position of the sliding assembly unit.

[0055] Figure 11 is a schematic diagram of the second sliding assembly unit after it has been constructed to its target position using the method of the present invention.

[0056] Figure 12 is a schematic diagram of the third sliding assembly unit after it has been constructed to its target position using the method of the present invention.

[0057] Figure 13 is a schematic diagram of the method of the present invention after removing the support frame, prestressed tensioned steel strands, sliding track and sliding seat.

[0058] Figure 14 is a side view of the sliding track and sliding components of the construction device for the large-span prestressed arch structure of the present invention.

[0059] Figure 15 is an enlarged structural diagram of point A in Figure 14.

[0060] Figure 16 is a side view of the sliding trolley of the construction device for large-span prestressed arch structures of the present invention.

[0061] In the diagram, 10-arch beam; 11-first segment; 12-second segment; 13-third segment; 14-beam base; 15-beam support leg; 21-first corbel; 22-support component; 23-sliding trolley; 30-second corbel; 40-upper steel column; 50-lower steel column; 60-sliding track; 61-limiting plate; 70-support frame; 80-prestressed tension steel strand; 90-connecting beam. Detailed Implementation

[0062] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0063] As shown in Figure 1, the construction method for large-span prestressed arch structures proposed in this invention includes the following steps:

[0064] Step 1: Based on the construction drawings of the arch structure, determine the sliding direction of the arch structure and divide the arch structure to be constructed into several sliding assembly units along the sliding direction; wherein, each sliding assembly unit includes several arch beams 10 distributed along the sliding direction, beam bases 14 set at both ends of the arch beams 10, upper steel columns 40 set at the bottom of the beam bases 14, and lower steel columns 50 set at the bottom of the upper steel columns 40.

[0065] Before step 1, there are preliminary preparation steps, including: determining the model and quantity of hoisting machinery and equipment, and the segmentation scheme of the arch structure based on the construction site conditions. For example, determining the number of sliding assembly units of the arch structure, the number of arch beams 10 in each sliding assembly unit, and the number of segments in each arch beam 10. Determining the construction sequence and construction scheme for each sliding assembly unit, establishing a finite element model, and analyzing the impact of the construction scheme on the deformation and internal forces of the arch structure. The pre-tensioning implementation plan was determined. The large-span arch beam 10 is designed with an arch, and its two ends are free during installation. Therefore, temporary tensioning measures are required before the ends are finally fixed. These tensioning measures cannot be removed before the ends of the arch structure are fully installed. Therefore, each arch beam 10, or steel box girder, is equipped with two sets of prestressed tensioning steel strands 80, symmetrically arranged on both sides of the arch beam 10. The material for the temporary tensioning measures is Q345B. Pre-tensioning calculations were performed. The prestressed tensioning steel strands 80 constrain the beam end deformation of the arch structure during assembly to prevent excessive deformation and detachment from the sliding track 60 under its own weight. The arch structure is installed on a concrete floor slab. The impact of the arch structure on the concrete floor slab was analyzed, calculation principles were determined, the structural bearing capacity under moderate earthquake loading was considered, and a finite element model was established to analyze the internal forces of the concrete floor slab during construction. The sliding track 60 was calculated to ensure the stability of the structure during the sliding construction process.

[0066] Step 2: Based on the construction location of the arch structure, construct several lower steel columns 50 distributed along the sliding direction at both ends of the arch structure. During this step, the supporting frame 70 can be constructed simultaneously. A schematic diagram of the completed supporting frame 70 and lower steel columns 50 is shown in Figure 2.

[0067] Before constructing the support frame 70, the number of sliding assembly units, their construction sequence, and the assembly position and target sliding position of each unit are determined. The assembly position of each sliding assembly unit is set at the same location, which is the starting position in the sliding direction. The target position of the first sliding assembly unit is the side away from the starting position along the sliding direction; the target position of the second sliding assembly unit is the side closer to the starting position of the first unit; the target position of the third sliding assembly unit is the side closer to the starting position of the second unit, and so on, thus determining the target position of each sliding assembly unit. The support frame 70 is constructed at the assembly position of the sliding assembly units, eliminating the need for construction at other locations, significantly reducing the workload of erecting the support frame 70, improving construction efficiency, and lowering material costs.

[0068] Step 3: Install the sliding rail 60 on both sides of the lower section steel column 50 at both ends of the arch structure; the length of the sliding rail 60 is arranged along the sliding direction.

[0069] As shown in Figure 3, lower steel columns 50 are respectively set at both ends of the arch structure. There are two sets of sliding tracks 60, which are respectively set at both ends of the arch structure. Each set includes two H-beams, and the two H-beams of each set of sliding tracks 60 are distributed on both sides of the lower steel column 50. The top surface of each H-beam is equipped with a slide rail. The sliding trolley 23 moves along the sliding direction on the slide rail. In this embodiment, the sliding track 60 includes four H-beams, with two H-beams respectively set at both ends of the arch structure. The top of each H-beam is equipped with a slide rail, and the sliding trolley 23 is set on the slide rail.

[0070] Since the lower steel column 50 is a vertical structure, in order to facilitate the installation of the sliding rail 60, second brackets 30 are welded on both sides of the lower steel column 50. The sliding rail 60 is then laid on the second brackets 30 on both sides of the lower steel column 50. To stabilize the structure, diagonal bracing can be installed below the sliding rail 60.

[0071] To ensure the stability of the sliding track 60, the sliding tracks 60 on both sides of the lower steel column 50 are connected as a whole by the connecting beam 90.

[0072] Step 4: Install the sliding trolley 23 on the starting section of the sliding track 60. The starting section of the sliding track 60 corresponds to the assembly position of the sliding assembly unit.

[0073] Step 5: Install a sliding seat of a sliding assembly unit, which connects the beam base 14 and the upper steel column 40, onto the sliding trolley 23. The sliding seat includes multiple first brackets 21 arranged along the length of the beam base 14 and a support member 22 located at the lower end of each first bracket 21; the support member 22 is mounted on the sliding trolley 23, and the first brackets 21 are connected to the upper steel column 40.

[0074] Step 5 specifically includes:

[0075] Step 51: Weld and fix multiple beam legs 15 along the length of the beam base 14 for connecting one by one with the multiple arch beams 10 of the sliding assembly unit;

[0076] Step 52: Weld and fix the multiple upper steel columns 40 of the sliding assembly unit to the bottom end of the beam base 14. The spacing and number of the multiple upper steel columns 40 of the sliding assembly unit correspond one-to-one with the spacing and number of the multiple lower steel columns 50 of the sliding assembly unit. The length of the beam base 14 of each sliding assembly unit, and the number and spacing of the upper steel columns 40 and lower steel columns 50 have been determined before construction. Therefore, the beam base 14, the upper steel columns 40, and the beam support 15 can be welded and assembled into a whole according to the given drawings.

[0077] Step 53: Install the sliding seat on both sides of the upper steel column 40 below the beam base 14. Since the sliding seat includes multiple first brackets 21 arranged along the length of the beam base 14 and support members 22 at the lower end of each first bracket 21, first weld the first brackets 21 to both sides of the upper steel column 40, and then weld or bolt the support members 22 to the bottom end of the first brackets 21. The support member 22 includes a vertically mounted telescopic cylinder to facilitate adjustment of the height of the sliding seat, thereby adjusting the height of the beam base 14.

[0078] Step 54: Install the support member 22 on the top of the sliding trolley 23. This allows the sliding seat connecting the beam base 14 and the upper steel column 40 to be installed on the sliding trolley 23.

[0079] After the sliding seat connecting the beam base 14 and the upper steel column 40 is installed on the sliding track 60, it is as shown in Figure 4.

[0080] Step 6: Erect the support frame 70. Assemble the arch beam 10 of the sliding assembly unit and connect the arch beam 10 to the beam base 14 at both ends.

[0081] Step 6 specifically includes:

[0082] Step 61: Divide the arch beam 10 of each sliding assembly unit into a first segment 11, a second segment 12, and a third segment 13 along its length; the second segment 12 is higher than the first segment 11 and the third segment 13; the second segment 12 is also located between the first segment 11 and the third segment 13. The segmentation of the arch beam 10 of each sliding assembly unit can be completed before step 1. After the segmentation is completed, each segment is prefabricated in the factory. During the construction of the arch structure, it is transported to the construction site. To improve construction efficiency, each segment is marked or numbered to facilitate the rapid assembly of each arch beam 10.

[0083] Step 62: Erect a support frame 70 for supporting the second segment 12 of each arch beam 10. The support frame 70 may be erected in this step or in any step prior to this step.

[0084] Step 63: First, install the second segment 12 of an arch beam 10 on the support frame 70, as shown in Figure 5. Then, install the first segment 11 and the third segment 13 of the arch beam 10, so that one end of the second segment 12 of the arch beam 10 is welded to fix the first segment 11, and the other end is welded to fix the third segment 13. Then, weld the far ends of the first segment 11 and the third segment 13 to the beam legs 15 of the beam base 14 at both ends of the arch beam 10, as shown in Figure 6.

[0085] Step 64: Repeat step 63 above to install the next adjacent arch beam 10 until all arch beams 10 of the sliding assembly unit are installed, as shown in Figure 7.

[0086] Step 65: Connect the adjacent arch beams 10 of the sliding assembly unit using crossbeams. That is, after each arch beam 10 of the sliding assembly unit is assembled, weld and fix the crossbeams between adjacent arch beams 10.

[0087] Of course, this step can also be carried out after each arch beam 10 is assembled. For example, after the first segment 11, the second segment 12 and the third segment 13 of each arch beam 10 are assembled, a crossbeam is welded to one side of the first segment 11 and the third segment 13 before assembling the next arch beam 10. At the same time as the first segment 11 and the third segment 13 of the next arch beam 10 are assembled, the crossbeam is welded between the two arch beams 10.

[0088] Step 7: Install and tension the prestressed steel strand 80 of the sliding assembly unit. As shown in Figure 8.

[0089] Step 7 includes:

[0090] Step 71: Arrange two sets of tensioning steel strands symmetrically on both sides of each arch beam 10 of the sliding assembly unit; wherein, a tensioning base is welded and fixed on both sides of each arch beam 10, and the tensioning base is located on the side of the arch beam 10 closer to the beam base 14. Two tensioning steel strands are threaded on the tensioning base on each side of the arch beam 10 and connected to the tensioning equipment.

[0091] Step 72: Use tensioning equipment to perform symmetrical tensioning operations in stages until the tensioning reaches the design value and forms the final stable state.

[0092] Step 8: As shown in Figure 9, the support frame 70 is unloaded, that is, the top of the support frame 70 is separated from the sliding assembly unit. As shown in Figure 10, the sliding trolley 23 is moved on the sliding track 60 to the target position of the sliding assembly unit using the traction device. That is, the traction device is connected to the sliding trolley 23, and the sliding trolleys 23 at both ends of the sliding assembly unit are pulled synchronously along the sliding direction, so that the multiple upper steel columns 40 of the sliding assembly unit are positioned one-to-one above the multiple lower steel columns 50 of the sliding assembly unit. The upper steel columns 40 and lower steel columns 50 of the sliding assembly unit are connected. When the upper section steel column 40 of the sliding assembly unit is above its lower section steel column 50, the sliding trolley 23 unloads, or the telescopic cylinder of the support member 22 retracts, reducing the support height of the support member 22 so that the bottom end of the upper section steel column 40 sits on the top end of the lower section steel column 50, and then the upper section steel column 40 and the lower section steel column 50 are welded and fixed.

[0093] Step 9: As shown in Figures 11 and 12, repeat steps 4 to 8 above to install the next sliding assembly unit; until all sliding assembly units of the arch structure are installed.

[0094] Step 10: Remove the supporting frame 70, prestressed tensioning steel strands 80, and sliding rail 60. As shown in Figure 13, removing the sliding rail 60 also includes removing the sliding seat, the second bracket 30, and the sliding trolley 23 on the sliding rail 60. This completes the construction of the large-span prestressed arch structure.

[0095] Based on the same inventive concept, the present invention also proposes a construction device for a large-span prestressed arch structure, wherein the arch structure is divided into several sliding assembly units along the sliding direction; each sliding assembly unit includes several arch beams 10 distributed along the sliding direction, beam bases 14 set at both ends of the arch beams 10, an upper steel column 40 set at the bottom end of the beam base 14, and a lower steel column 50 set at the bottom end of the upper steel column 40.

[0096] The construction device includes: two sets of sliding tracks 60, several sliding components, a support frame 70, and several sets of prestressed tensioned steel strands 80.

[0097] Two sets of sliding tracks 60 are installed at both ends of the arch structure to be constructed; the length of the sliding tracks 60 is arranged along the sliding direction. Specifically, the sliding tracks 60 are installed on both sides of the lower section steel column 50 of the arch structure.

[0098] Several sliding components are installed one by one on the starting section of the sliding track 60 to support the arch beam 10, beam base 14, and upper steel column 40 of each sliding assembly unit, and to move the sliding assembly unit in the starting section to its target position. The installation of several sliding components one by one on the starting section of the sliding track 60 means that when assembling and sliding each sliding assembly unit, several sliding components are installed on the starting section of the sliding track 60. After the sliding assembly unit moves to its target position, several more sliding components are installed on the starting section of the sliding track 60 to support the arch beam 10, beam base 14, and upper steel column 40 of the next sliding assembly unit. In other words, each sliding assembly unit in this embodiment corresponds to a set of several sliding components.

[0099] The support frame 70 is set between the starting sections of the two sets of sliding tracks 60 for supporting and unloading each sliding assembly unit of the starting section.

[0100] Several sets of prestressed tensioning steel strands 80 are symmetrically arranged on both sides of each arch beam 10 of the sliding assembly unit. This also includes tensioning equipment used in conjunction with the prestressed tensioning steel strands 80; existing equipment is selected for this purpose.

[0101] Each of the sliding components includes: a sliding trolley 23, a sliding seat, and a traction device.

[0102] The sliding trolley 23 is installed on the sliding track 60. When each sliding assembly unit performs a sliding operation, at least two sliding trolleys 23 are set on each sliding track 60.

[0103] A sliding seat is mounted on the sliding trolley 23, connecting the beam base 14 of the sliding assembly unit and the upper steel column 40; the beam base 14 connects to the arch beam 10 of the sliding assembly unit. The sliding seat includes a plurality of first brackets 21 arranged along the length of the beam base 14 and a support member 22 disposed at the lower end of each first bracket 21, the first bracket 21 being connected to the upper steel column 40. The bottom end of the support member 22 is mounted on the sliding trolley 23.

[0104] A traction device is connected to the sliding trolley 23 and is used to move the sliding trolley 23 on the sliding track 60 to the target position of the sliding assembly unit. The traction device includes an electric traction hoist and an electric device connected thereto, the electric traction hoist being connected to the sliding trolley 23. In some embodiments, the traction device may also employ other equipment, such as a winch.

[0105] Figure 14 is a side view of the sliding track 60 and sliding components of the construction device for the large-span prestressed arch structure of the present invention. Second brackets 30 are respectively provided on both sides of the lower steel column 50, and the sliding track 60 is installed on the second brackets 30. The sliding tracks 60 on both sides of the lower steel column 50 are also connected by connecting beams 90. A sliding trolley 23 is set on the sliding track 60, and the support member 22 of the sliding seat is set on the sliding trolley 23. The support member 22 is connected above the first bracket 21, which is located on both sides of the upper steel column 40. The upper steel column 40 is connected to a beam base 14.

[0106] As shown in Figure 15, limit plates 61 are provided on both sides of the sliding track 60, and the sliding trolley 23 is located between the limit plates 61 on both sides of the sliding track 60. The limit plates 61 are angle steel with a cross-section of L75×5. By providing limit plates 61 on both sides of the sliding track 60, the movement path of the sliding trolley 23 is restricted, ensuring the correctness of the sliding direction of the sliding assembly unit and guaranteeing the construction quality.

[0107] As shown in Figure 16, the sliding trolley 23 includes a body and wheels mounted on the lower end of the body. The body is made of 20mm thick steel plate of Q345B material, and the wheels are made of 60mm diameter round steel. Fixed plates are provided at both the front and rear ends of the body, and through holes are provided on the fixed plates for connecting the traction device.

[0108] The construction device for large-span prestressed arch structures of the present invention is easy to manufacture, quick to install, and convenient to construct, greatly reducing the amount of temporary support required, resulting in significant social and economic benefits, and effectively solving the problems in the current construction of large-span prestressed arch structures.

[0109] The above description is merely a preferred embodiment of the present invention. The scope of protection of the present invention is not limited to the above embodiments. All technical solutions falling within the scope of the present invention's concept are within the scope of protection of the present invention. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principle of the present invention should also be considered within the scope of protection of the present invention.

Claims

1. A construction method for a large-span prestressed arch structure, characterized in that, Includes the following steps: Step 1: Based on the construction drawings of the arch structure, determine the sliding direction of the arch structure and divide the arch structure to be constructed into several sliding assembly units along the sliding direction. Each sliding assembly unit includes several arch beams distributed along the sliding direction, beam bases at both ends of the arch beams, upper steel columns at the bottom of the beam bases, and lower steel columns at the bottom of the upper steel columns. Step 2: Based on the construction location of the arch structure, construct several lower steel columns located at both ends of the arch structure along the sliding direction. Step 3: Install sliding tracks on both sides of the lower steel columns at both ends of the arch structure; the length of the sliding tracks is arranged along the sliding direction. Step 4: Install the sliding trolley on the starting section of the sliding track. Step 5: Assemble one sliding assembly unit. Step 6: Install the sliding seat of the beam base and the upper steel column of the assembly unit on the sliding trolley; Step 7: Set up the support frame, assemble the arch beam of the sliding assembly unit, and connect the arch beam to the beam base at both ends; Step 8: Install and tension the prestressed steel strands of the sliding assembly unit; Step 9: Separate the top of the support frame from the sliding assembly unit, use the traction device to pull the sliding trolley to the target position of the sliding assembly unit on the sliding track, and connect the upper and lower steel columns of the sliding assembly unit; Step 10: Repeat steps 4 to 8 above to install the next sliding assembly unit; until all sliding assembly units of the arch structure are installed; Step 11: Remove the support frame, prestressed steel strands and sliding track.

2. The construction method for a large-span prestressed arch structure according to claim 1, characterized in that, Step 5 includes: Step 51, connecting multiple beam legs along the length of the beam base for connection with multiple arch beams of the sliding assembly unit; Step 52, welding and fixing multiple upper steel columns of the sliding assembly unit to the bottom of the beam base, wherein the spacing and number of the multiple upper steel columns of the sliding assembly unit correspond one-to-one with the spacing and number of the multiple lower steel columns of the sliding assembly unit; Step 53, installing the sliding seat on both sides of the upper steel columns below the beam base; the sliding seat includes multiple first brackets arranged along the length of the beam base and a support member arranged at the lower end of each first bracket; the first brackets are connected to the upper steel columns; Step 54, installing the sliding seat connected to the beam base and the upper steel columns on the sliding trolley.

3. The construction method for a large-span prestressed arch structure according to claim 1, characterized in that, Step 6 includes: Step 61, dividing the arch beam of each sliding assembly unit into a first segment, a second segment, and a third segment along its length; the second segment is higher than the first and third segments; Step 62, erecting a support frame to support the second segment of each arch beam; Step 63, first installing the second segment of an arch beam on the support frame, then installing the first and third segments of the arch beam, and then welding and fixing the far ends of the first and third segments to the beam bases at both ends of the arch beam; Step 64, repeating step 63 to install the next adjacent arch beam until all the arch beams of the sliding assembly unit are installed; Step 65, connecting the adjacent arch beams of the sliding assembly unit using crossbeams.

4. The construction method for a large-span prestressed arch structure according to claim 1, characterized in that, Step 7 includes: Step 71, symmetrically arranging two sets of tensioning steel strands on both sides of each arch beam of the sliding assembly unit; Step 72, performing tensioning operations in stages and symmetrically until the tensioning reaches the design value and forms the final stable state.

5. The construction method for a large-span prestressed arch structure according to claim 1, characterized in that, Step 8, which involves using a traction device to move the sliding trolley on the sliding track to the target position of the sliding assembly unit, includes: connecting the traction device to the sliding trolley and synchronously pulling the sliding trolleys at both ends of the sliding assembly unit along the sliding direction, so that the multiple upper steel columns of the sliding assembly unit are positioned one-to-one above the multiple lower steel columns of the sliding assembly unit.

6. A construction device for a large-span prestressed arch structure, used to implement the construction method as described in claim 1, characterized in that, The arch structure is divided into several sliding assembly units along the sliding direction; each sliding assembly unit includes several arch beams distributed along the sliding direction, beam bases at both ends of the arch beams, an upper steel column at the bottom of the beam base, and a lower steel column at the bottom of the upper steel column; the construction device includes: two sets of sliding tracks, set at both ends of the arch structure to be constructed; the length direction of the sliding tracks is arranged along the sliding direction; several sliding components are installed one by one in the starting section of the sliding tracks to support the arch beams, beam bases, and upper steel columns of each sliding assembly unit, and to move the sliding assembly unit in the starting section to that sliding assembly unit. The sliding assembly includes: the target position of the assembly unit; a support frame, set between the starting sections of two sets of sliding tracks, used for supporting and unloading each sliding assembly unit in the starting section; and several sets of prestressed tensioned steel strands, symmetrically arranged on both sides of each arch beam of the sliding assembly unit; the sliding assembly includes: a sliding trolley, installed on the sliding track; a sliding seat, set on the sliding trolley, the sliding seat connecting the beam base of the sliding assembly unit and the upper steel column; the beam base connecting the arch beam of the sliding assembly unit; and a traction device, connected to the sliding trolley, used to traction the sliding trolley to move on the sliding track to the target position of the sliding assembly unit.

7. The construction device for a large-span prestressed arch structure according to claim 6, characterized in that, The sliding seat includes a plurality of first brackets arranged along the length of the beam base and a support member disposed at the lower end of each first bracket; the support member is disposed on the sliding trolley; the first brackets are connected to the upper steel column.

8. The construction device for a large-span prestressed arch structure according to claim 6, characterized in that, Limiting plates are provided on both sides of the sliding track, and the sliding trolley is located between the limiting plates on both sides of the sliding track.

9. The construction device for a large-span prestressed arch structure according to claim 6, characterized in that, The construction device also includes several second brackets, which are connected to both sides of the lower steel column; the sliding rail is installed on the second brackets.

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