A force installation method for erecting steel truss arch girder members

Abstract

The present application belongs to the field of bridge construction technology, and particularly relates to a force installation method for erecting steel truss arch main girder members by scattered assembly. The present application develops a force installation technology for erecting steel truss arch main girder members by scattered assembly. By changing the installation process of the members, the main girder inclined rods can be smoothly installed, which provides an important guarantee for the normal erection of the steel truss arch. The technology has the beneficial effects of good economy, fast construction, strong practicability, guaranteed construction quality, etc. The object of the technology not only includes the steel truss arch, but also is applicable to the force installation of steel truss girder and other steel truss structure members.

Description

Technical Field

[0001] This invention belongs to the field of bridge construction technology, and specifically relates to a method for force-driven installation of steel truss arch main beam members used in the assembly and erection of individual components. Background Technology

[0002] Steel truss arch bridges, with their high vertical stiffness, high load-bearing capacity, strong span capability, fast construction speed, and beautiful shape, have been widely used in newly built highway and railway bridges both domestically and internationally. The main girder of a steel truss arch bridge mainly consists of a lower chord, upper chord, diagonal members, and vertical members. At the top of the main pier, there is usually a stiffening chord below the main girder. For large-span steel truss arch bridges, the main truss members are often installed using a single-piece hoisting and assembly process with a girder erecting crane. The conventional installation sequence for the main girder members is lower chord, vertical members, diagonal members, and upper chord, with the members connected by high-strength bolts. Due to the complex structure and stress of steel truss arch bridges, some members often require force to be installed in place. For the installation of main girder members, the force required using conventional procedures is generally small, allowing for smooth assembly. However, when there are stiffening chord members at the top of the main pier, the diagonal members and upper chord become difficult to connect using conventional installation procedures, even with significant force. Therefore, this invention provides an optimized installation technology for main beam members with stiffening chord members in the pier top area. This method allows for the smooth installation of difficult-to-install diagonal members without altering the bridge's design alignment. Summary of the Invention

[0003] In order to solve the above-mentioned problems in the existing technology, the purpose of this invention is to provide a method for force-driven installation of main beam members of steel truss arches in a modular assembly manner. By optimizing and changing the installation process of the members, the method enables the smooth installation of the diagonal members of the main beam in the complex area with stiffening chords at the pier top.

[0004] The technical solution adopted in this invention is as follows:

[0005] A method for force-driven installation of main beam members of a steel truss arch used in modular assembly.

[0006] Used for steel truss arch bridges, the steel truss arch bridges include side piers and main piers, a stiffening chord is connected to the main pier, a lower chord is connected between the stiffening chord and the side pier, an upper chord is provided above the lower chord, and diagonal and vertical members are connected between the lower chord and the upper chord;

[0007] In the top area of ​​the main pier, the connection between the upper chord and the vertical member is the first joint, the connection between the lower chord and the vertical member is the second joint, the connection between the upper chord and the main truss is the third joint, and the connection between the upper chord and the diagonal member is the fourth joint.

[0008] Includes the following steps:

[0009] S1: Loosen all the punches and bolts on the upper end of the splicing plate of the first joint, so that the upper chord is close to the vertical bar, and arrange a set of tie rods on the river side and the bank side of the first joint, and temporarily lock them with fine rolled threaded steel.

[0010] S2: Loosen all the punches and bolts on the upper part of the splicing plate of the second joint, so that the vertical bar is close to the lower chord. The splicing plates on all four sides of the second joint are installed on the lower chord according to the design position and are not retracted.

[0011] S3: Remove all the punches and bolts from the web of the third joint, leaving 30% of the punches and 10% of the ordinary bolts on the bottom plate of the third joint.

[0012] S4: Arrange a set of tie rods on the top and bottom surfaces of the fourth joint and install a through jack tie rod. Connect the diagonal rod to the upper chord with 30% punch pins on the side of the fourth joint. Then remove the tie rods to complete the installation of 30% punch pins on the top and bottom surfaces of the fourth joint.

[0013] S5: Arrange a set of reaction brackets on the river side and the bank side of the second joint and install jacks to jack them up. Connect the vertical rod to the lower chord with 30% punchings on the side of the second joint. Then remove the reaction brackets and complete the installation of 30% punchings on the river side and the bank side of the second joint.

[0014] S6: Loosen all the remaining punches and bolts on the bottom plate of the third joint, then remove the tie rod at the position of the first joint, re-arrange the reaction bracket and install the jacks to jack up, connect the vertical rod to the upper chord with 30% punches on the side of the first joint, then remove the reaction bracket and complete the installation of 30% punches on the river side and the bank side.

[0015] S7: Arrange a 7-shaped plate on the top plate of the third joint and install jacks for counter-pressure, adjust the misalignment of the upper chord joint, and then insert 30% punch nails into the web plate and bottom plate to connect the upper chord to the main truss node.

[0016] S8: Complete the construction of the remaining high-strength bolts.

[0017] As a preferred embodiment of the present invention, in step S3, the base plate of the third joint retains 30% punches and 10% ordinary bolts.

[0018] As a preferred embodiment of the present invention, in step S4, the diagonal bar is connected to the upper chord bar on the side of the fourth joint using a 30% punch.

[0019] As a preferred embodiment of the present invention, in step S4, the tie rods are removed to complete the installation of 30% of the punches on the top and bottom surfaces.

[0020] As a preferred embodiment of the present invention, in step S5, the vertical rod is connected to the lower chord using a 30% punch on the side of the second joint.

[0021] As a preferred embodiment of the present invention, in step S5, the reaction bracket is removed, and the installation of 30% of the punches on the river side and bank side of the second joint is completed.

[0022] As a preferred embodiment of the present invention, in step S6, the side of the first joint is connected to the upper chord with a 30% punch.

[0023] As a preferred embodiment of the present invention, in step S6, the reaction bracket is removed, and the installation of 30% of the drift pins on the river side and the bank side is completed.

[0024] As a preferred embodiment of the present invention, in step S7, 30% punch pins are inserted into the web and bottom plate of the third joint to connect the upper chord to the main truss node.

[0025] The beneficial effects of this invention are as follows:

[0026] 1. The present invention solves the problem of difficult installation of some members of steel truss arch by changing the assembly process of the members, without changing the length of the members or remaking the members; the auxiliary adjustment device is simple to manufacture, small in size, easy to install and remove, and reusable.

[0027] 2. This invention enables rapid installation of poles, saving construction time and achieving good economic benefits.

[0028] 3. This invention can be used for the installation of members requiring forced force in complex areas of steel truss arches, and has good engineering application value.

[0029] 4. The implementation process of this invention is simple. While ensuring the smooth installation of the members, it will not change the design line of the structure, and the construction quality can be guaranteed. Attached Figure Description

[0030] Figure 1 This is a schematic diagram of the assembly and installation of steel truss arch members.

[0031] Figure 2 yes Figure 1 Enlarged schematic diagram of the installation of the diagonal bracing of the main beam;

[0032] Figure 3 yes Figure 2 A magnified view of a section at point A in the middle;

[0033] Figure 4 yes Figure 2 A magnified view of part B in the image;

[0034] Figure 5 yes Figure 2 A magnified view of part C;

[0035] Figure 6 yes Figure 2 A magnified view of part D;

[0036] In the diagram: 1-First joint; 2-Second joint; 3-Third joint; 4-Fourth joint; 5-Upper chord; 6-Vertical member; 7-Lower chord; 8-Main truss node; 9-Diagonal member; 10-Tie bracket; 11-Precision rolled threaded steel; 12-Reaction bracket; 13-Jack; 14-Through jack; 15-Seven plate. Detailed Implementation

[0037] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0038] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention. It should be noted that, unless otherwise specified, the embodiments and features described in the embodiments of the invention can be combined with each other.

[0039] like Figures 1-6 As shown, the steel truss arch bridge includes side piers and main piers. A stiffening chord is connected to the main pier. A lower chord 7 is connected to the stiffening chord and the side pier. An upper chord 5 is set above the lower chord 7. A diagonal member 9 and a vertical member 6 are connected between the lower chord 7 and the upper chord 5. In the top area of ​​the main pier, the connection between the upper chord 5 and the vertical member 6 is the first joint 1, the connection between the lower chord 7 and the vertical member 6 is the second joint 2, the connection between the upper chord 5 and the main truss is the third joint 3, and the connection between the upper chord 5 and the diagonal member 9 is the fourth joint 4.

[0040] The method for force-driven installation of the main beam members of the steel truss arch in this embodiment includes the following steps:

[0041] S1: Loosen all the punches and bolts on the upper end of the first splicing plate, so that the upper chord 5 and the vertical bar 6 are tightly attached. Arrange a set of tie rods 10 on the river side and the bank side respectively, and temporarily lock them with Ф50 precision rolled threaded steel bars 11.

[0042] S2: Unlock all the punches and bolts on the upper part of the splicing plate of the second joint 2, so that the vertical rod 6 is tightly attached to the lower chord 7, and the splicing plates on all four sides are installed on the lower chord 7 according to the design position, without retracting.

[0043] S3: Remove all the punches and bolts from the web of the third joint, leaving 30% of the punches and 10% of the ordinary bolts on the bottom plate.

[0044] S4: Arrange a set of tie rods 10 on the top and bottom surfaces of the fourth joint 4 and install through jacks 14 for tie rods. Connect the diagonal rod 9 to the upper chord rod 5 with 30% punches on the side. Then remove the tie rods 10 to complete the installation of 30% punches on the top and bottom surfaces.

[0045] S5: Arrange a set of reaction brackets 12 on the river side and the bank side of the second joint 2 and install jacks 13 to support them. Connect the vertical rod 6 to the lower chord rod 7 with 30% punchings on the side. Then remove the reaction brackets 12 to complete the installation of 30% punchings on the river side and the bank side.

[0046] S5: Unravel all the remaining punches and bolts on the bottom plate of the third joint 3, then remove the tie rod 10 at the position of the first joint 1, replace it with the reaction rod 12 and install the jack 13 to support it, connect the vertical rod 6 to the upper chord rod 5 with 30% punches on the side, then remove the reaction rod 12 to complete the installation of 30% punches on the river side and the bank side.

[0047] S7: Arrange the 7-shaped plate 15 on the top plate of the third joint 3 and install the jack 13 for counter-pressure, adjust the misalignment of the upper chord 5 joint, and then insert 30% punching pins into the web plate and the bottom plate to connect the upper chord 5 to the main truss node 8.

[0048] S8: Remove the adjustment devices at each joint position and complete the construction of the remaining high-strength bolts.

[0049] By adopting the above steps, the diagonal members 9 of the main beam of the steel truss arch can be successfully assembled.

[0050] This invention is applicable not only to the installation of steel truss arches, but also to the installation of steel truss structural members such as steel truss beams under load.

[0051] By adopting the above technical solution, the present invention enables the smooth assembly of the diagonal members 9 of the main beam of the steel truss arch, and the specific beneficial effects are:

[0052] First, construction is convenient: by changing the assembly process of the members, the problem of difficult installation of some members of the steel truss arch is solved, without the need to change the length of the members or remake the members; the auxiliary adjustment device is simple to make, small in size, easy to install and remove, and reusable.

[0053] Secondly, it is economical: this method enables rapid installation of poles, saves construction time, and is economical.

[0054] Third, it is highly practical: it can be used for the installation of members requiring force in complex areas of steel truss arches, and has good engineering application value.

[0055] Fourth, construction quality is guaranteed: The implementation process of this invention is simple, and while ensuring the smooth installation of the poles, it will not change the design line of the structure, thus ensuring construction quality.

[0056] This invention is not limited to the above-described optional embodiments. Anyone can derive other various forms of products under the guidance of this invention. However, regardless of any changes made in their shape or structure, any technical solution that falls within the scope of the claims of this invention shall be protected by this invention.

Claims

1. A method for force-driven installation of main beam members of a steel truss arch used in modular assembly. For use in steel truss arch bridges, the steel truss arch bridge includes side piers and main piers, a stiffening chord is connected to the main pier, a lower chord (7) is connected between the stiffening chord and the side pier, an upper chord (5) is provided above the lower chord (7), and a diagonal bar (9) and a vertical bar (6) are connected between the lower chord (7) and the upper chord (5). In the top area of ​​the main pier, the connection between the upper chord (5) and the vertical member (6) is the first joint (1), the connection between the lower chord (7) and the vertical member (6) is the second joint (2), the connection between the upper chord (5) and the main truss is the third joint (3), and the connection between the upper chord (5) and the diagonal member (9) is the fourth joint (4). Its features are: Includes the following steps: S1: Unlock all the punches and bolts on the upper end of the splicing plate of the first joint (1) so that the upper chord (5) is close to the vertical bar (6). Arrange a set of tie rods (10) on the river side and the bank side of the first joint (1) and temporarily lock them with fine rolled threaded steel (11). S2: Unscrew all the punches and bolts on the upper end of the splicing plate of the second joint (2) so that the vertical rod (6) is close to the lower chord (7). The splicing plates on all four sides of the second joint (2) are installed on the lower chord (7) according to the design position and are not retracted. S3: Remove all the punches and bolts from the web of the third joint (3), and retain 30% punches and 10% ordinary bolts on the bottom plate of the third joint (3); S4: Arrange a set of tie rods (10) on the top and bottom surfaces of the fourth joint (4) and install a through jack (14) for tie rods. Connect the diagonal rod (9) to the upper chord rod (5) with 30% punches on the side of the fourth joint (4). Then remove the tie rods (10) to complete the installation of 30% punches on the top and bottom surfaces of the fourth joint (4). S5: Arrange a set of reaction brackets (12) on the river side and the bank side of the second joint (2) and install jacks (13) to support them. Connect the vertical rod (6) to the lower chord rod (7) with 30% punchings on the side of the second joint (2). Then remove the reaction brackets (12) to complete the installation of 30% punchings on the river side and the bank side of the second joint (2). S6: Unravel all the remaining punches and bolts on the bottom plate of the third joint (3), then remove the tie rod (10) at the position of the first joint (1), replace it with the reaction rod (12) and install the jack (13) to jack. Connect the vertical rod (6) to the upper chord rod (5) with 30% punches on the side of the first joint (1), then remove the reaction rod (12) to complete the installation of 30% punches on the river side and the bank side. S7: Arrange a 7-shaped plate (15) on the top plate of the third joint (3) and install a jack (13) for counter-pressure, adjust the misalignment of the upper chord (5) joint, and then insert 30% punch nails into the web plate and the bottom plate to connect the upper chord (5) with the main truss node (8). S8: Complete the construction of the remaining high-strength bolts.

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