Railway track laying method for cable-stayed bridge with track and deck in same layer and asymmetric main girder cross section arrangement

Abstract

A rail laying method of a cable-stayed bridge with a track in the same layer and an asymmetric main beam section arrangement is performed in the following steps: track sides and highway sides are divided on the main beam bridge deck according to design drawings, m track side moving trolleys are arranged on the track sides, each track side moving trolley is provided with a pre-pressing block, the total mass of one track side moving trolley and the pre-pressing block thereon is p, meanwhile, the m track side moving trolleys are distributed at equal intervals along the longitudinal bridge direction of the main beam bridge deck on the track sides, and the distance between the track side moving trolley and the structural center line of the main beam bridge deck is H1, n highway side moving trolleys are arranged on the highway sides, each highway side moving trolley is provided with a pre-pressing block, the total mass of one highway side moving trolley and the pre-pressing block thereon is p, meanwhile, the n highway side moving trolleys are distributed at equal intervals along the longitudinal bridge direction of the main beam bridge deck on the highway sides, and the distance between the highway side moving trolley and the structural center line of the main beam bridge deck is H2.

Description

Technical Field

[0001] This invention relates to the field of bridge construction, and in particular to a method for laying tracks for cable-stayed bridges with asymmetrical main beam cross-sections arranged on the same level as the track. Background Technology

[0002] Currently, for cable-stayed bridges with long spans, track and road on the same level, and asymmetrical arrangement of main girder cross sections (such as...), Figure 1 As shown in the diagram, because the widths of the track side and the road side are different (i.e., asymmetrical arrangement), an unbalanced torque is generated during track laying. Traditionally, there are two ways to solve this problem:

[0003] First, no counterweight is set. The main beam of the cable-stayed bridge is "tilted" during the cantilever assembly process, and the main beam is "corrected" by laying tracks during the construction of the auxiliary structures.

[0004] Secondly, the main beam is assembled in a symmetrical cantilever configuration, and the auxiliary structures are constructed by setting up counterweight concrete on the roadside to balance the torque generated during track laying.

[0005] The former method results in a large torsional angle in the main girder throughout the construction process, making the "tilted" main girder difficult to splice. The latter method, while ensuring that the main girder erection stage is the same as conventional bridge construction, requires synchronous construction with the transverse counterweight concrete during the track laying stage. However, due to the different working environments and varying degrees of difficulty in the two construction processes, achieving synchronous construction is very difficult (almost impossible to achieve completely synchronously). Improper operation can lead to transverse torsion of the main girder, resulting in the track bed concrete formwork not being vertical, causing problems such as difficulty in controlling the amount of concrete poured and difficulty in controlling the rail top elevation. If necessary, local adjustments to the cable tension may be required to change the torsional state of the main girder cross-section.

[0006] Therefore, a method or apparatus is needed to solve the above problems. Summary of the Invention

[0007] This invention addresses the aforementioned shortcomings of existing technologies by proposing a cable-stayed bridge track-laying method with an asymmetrical main beam cross-section arrangement on the same floor, which can effectively improve construction efficiency while ensuring construction accuracy.

[0008] The technical solution of this invention is: a method for laying tracks for a cable-stayed bridge with an asymmetrical main beam cross-section arrangement on the same floor as the track, characterized in that: the method is carried out in the following steps in sequence:

[0009] First, the main girder bridge deck 1 is divided into the track side and the highway side according to the design drawings.

[0010] m track-side moving trolleys 2 are arranged on the track side, and each track-side moving trolley 2 is equipped with a preloading block 3. The total mass of one track-side moving trolley 2 and its preloading block 3 is p. The m track-side moving trolleys 2 are evenly distributed along the longitudinal direction of the main beam bridge deck 1 on the track side, and the distance between the track-side moving trolley 2 and the structural centerline of the main beam bridge deck 1 is H1.

[0011] n roadside mobile trolleys 4 are arranged on the roadside, and each roadside mobile trolley 4 is equipped with a preloading block 3. The total mass of one roadside mobile trolley 4 and its preloading block 3 is p. The n roadside mobile trolleys 4 are evenly distributed along the longitudinal direction of the main girder bridge deck 1 on the roadside, and the distance between the roadside mobile trolley 4 and the structural centerline of the main girder bridge deck 1 is H2.

[0012] And mp·H1=np·H2, that is, mH1=nH2.

[0013] Construction begins at end a of the main girder deck 1, proceeding towards end b from both the track side and the highway side. The length of the construction section of the main girder deck 1 is L.

[0014] For the track side, each completed length is The construction of L drives all the trackside moving trolleys 2 to move synchronously towards end b while maintaining the same spacing. L, until all trackside construction is completed, all trackside moving trolleys 2 leave the main girder bridge deck 1 of the construction section.

[0015] Meanwhile, for the highway side, each completed length is During the construction of L, all the roadside mobile trolleys 4 are driven to move synchronously towards end b while maintaining the same spacing. L, until all construction on the roadside is completed, all roadside mobile trolleys 4 leave the main girder bridge deck 1 of the construction section.

[0016] The main girder bridge deck 1 is divided into several construction sections. Following the steps described above, all construction sections are constructed sequentially from one end of the main girder bridge deck 1 to the other end until the entire length of the main girder bridge deck 1 is completed.

[0017] Compared with the prior art, the present invention has the following advantages:

[0018] Compared with traditional construction methods, this cable-stayed bridge track-laying method creatively utilizes a movable and adjustable counterweight formed by multiple preload blocks and trolleys to dynamically balance the bridge deck on either the track or road side during construction. The adjustable counterweight adjusts in sync with the construction process, ensuring that the torque on both the track and road sides remains largely constant during construction. This method ensures the accuracy of track top construction while maintaining the controllable alignment of the main girder during the cantilever assembly and auxiliary facility construction stages. Therefore, it possesses numerous advantages and is particularly suitable for widespread application in this field, with a very broad market prospect. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the usage state of the main beam bridge deck in a cable-stayed bridge that requires construction according to the method described in this invention.

[0020] Figure 2 This is a top view of the construction section in an embodiment of the present invention.

[0021] Figure 3 This is the front view of the construction section in an embodiment of the present invention.

[0022] 1. Main girder bridge deck; 2. Track-side moving trolley; 3. Prestressing block; 4. Road-side moving trolley. Detailed Implementation

[0023] The specific embodiments of the present invention will be described below with reference to the accompanying drawings: Figures 1 to 3 As shown, a method for laying tracks for a cable-stayed bridge with an asymmetrical main beam cross-section arranged on the same level as the track is carried out in the following steps:

[0024] First, the main girder bridge deck 1 is divided into the track side and the road side according to the design drawings. The width of the road side is greater than that of the track side.

[0025] Then, m track-side moving trolleys 2 are arranged on the track side. Each track-side moving trolley 2 is equipped with a pre-compression block 3. The total mass of one track-side moving trolley 2 and its pre-compression block 3 is p. Thus, the total mass of the m track-side moving trolleys 2 plus the pre-compression block 3 is mp. The m track-side moving trolleys 2 are evenly distributed along the longitudinal direction of the main beam bridge deck 1 on the track side, and the distance between the track-side moving trolleys 2 and the structural centerline of the main beam bridge deck 1 is H1.

[0026] n roadside mobile trolleys 4 are arranged on the roadside, and each roadside mobile trolley 4 is equipped with a preloading block 3. The total mass of one roadside mobile trolley 4 and its preloading block 3 is p. Thus, the total mass of the n roadside mobile trolleys 4 plus the preloading block 3 is np. At the same time, the n roadside mobile trolleys 4 are evenly distributed along the longitudinal direction of the main girder bridge deck 1 on the roadside, and the distance between the roadside mobile trolleys 4 and the structural centerline of the main girder bridge deck 1 is H2.

[0027] It is necessary to ensure that mp·H1=np·H2, that is, mH1=nH2, that is, the loads on the highway side and the track side need to be balanced with the structural centerline of the main beam bridge deck 1 as the axis of symmetry.

[0028] Starting from end a of the main girder bridge deck 1, construction is carried out on both the track side and the highway side towards end b. The length of the main girder bridge deck 1 in the construction section is L. It should be noted that the construction on the track side and the highway side is carried out simultaneously and independently.

[0029] For the track side, each completed length is The construction of L drives all the trackside moving trolleys 2 to move synchronously towards end b while maintaining the same spacing. For example, assuming L is 100 meters and m is 11, after every 10 meters of construction is completed, the 11 track-side moving trolleys 2 must move 10 meters synchronously towards end b. At this point, one track-side moving trolley 2 will leave the construction section from end b, leaving 10 track-side moving trolleys on the track. This process continues until all track-side construction is completed and all track-side moving trolleys 2 have left the main girder bridge deck 1 of the construction section.

[0030] Meanwhile, for the highway side, each completed length is During the construction of L, all the roadside mobile trolleys 4 are driven to move synchronously towards end b while maintaining the same spacing. L, until all construction on the roadside is completed, all roadside mobile trolleys 4 leave the main girder bridge deck 1 of the construction section.

[0031] In other words, the mobile trolley will drive the preload block 3 and dynamically adjust the overall load on one side according to the specific construction process. For each additional structure added to the construction section, the corresponding number of mobile trolleys will be removed to ensure that the overall torque of the construction section remains roughly unchanged. When both the road side and the track side are operated in the above manner, the overall torque remains unchanged throughout their respective construction processes, which can improve construction efficiency and avoid problems caused by the difference in torque on both sides.

[0032] In practice, the main girder bridge deck 1 is divided into several equal-length construction sections in advance. Following the steps described above, all construction sections are constructed sequentially from one end of the main girder bridge deck 1 to the other end until the entire length of the main girder bridge deck 1 is completed.

Claims

1. A method for track laying of a cable-stayed bridge with a rail on the same level and an asymmetric cross-section of the main girder, characterized in that: The method is sequentially performed according to the following steps: First, the track side and the highway side are divided on the main girder bridge deck (1) according to the design drawings, m track side moving trolleys (2) are arranged on the track side, each track side moving trolley (2) is provided with a pre-pressing block (3), the total mass of one track side moving trolley (2) and the pre-pressing block (3) thereon is p, meanwhile, the m track side moving trolleys (2) are distributed at equal intervals along the longitudinal bridge direction of the main girder bridge deck (1) on the track side, and the distance between the track side moving trolley (2) and the structural center line of the main girder bridge deck (1) is H1, n highway side moving trolleys (4) are arranged on the highway side, each highway side moving trolley (4) is provided with a pre-pressing block (3), the total mass of one highway side moving trolley (4) and the pre-pressing block (3) thereon is p, meanwhile, the n highway side moving trolleys (4) are distributed at equal intervals along the longitudinal bridge direction of the main girder bridge deck (1) on the highway side, and the distance between the highway side moving trolley (4) and the structural center line of the main girder bridge deck (1) is H2, And mp×H1=np×H2, that is, mH1=nH2, Wherein mp is the total mass of m track side moving trolleys (2) plus pre-pressing blocks (3), np is the total mass of n highway side moving trolleys (4) plus pre-pressing blocks (3), Starting from the a end of the main girder bridge deck (1), construction is carried out from the track side and the highway side to the b end respectively, and the length of the construction section of the main girder bridge deck (1) is L, For the track side, after each length of L is completed, all the track side moving trolleys (2) are driven to move synchronously towards the b end at a constant distance L until the track side construction is completed and all the track side moving trolleys (2) leave the main girder bridge deck (1) of the construction section, L until the track side construction is completed and all the track side moving trolleys (2) leave the main girder bridge deck (1) of the construction section, At the same time, for the highway side, after completing the construction of a length of L, all the highway side moving trolleys (4) are driven to move synchronously to the b end by a length of L while maintaining the same distance L until the construction of the highway side is completed and all the highway side moving trolleys (4) leave the main girder bridge deck (1) of the construction section, The main girder bridge deck (1) is divided into several construction sections, and all construction sections are sequentially constructed from one end of the main girder bridge deck (1) to the other end according to the above steps, until the full-length construction of the main girder bridge deck (1) is completed.

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