Construction method for dislocation assembly and translation of tall steel trusses adjacent to high-speed railway lines

Abstract

A construction method for the off-site assembly and translation of tall steel trusses adjacent to high-speed railway lines. This method moves the steel trusses from their original design positions a certain distance away from the high-speed railway line for assembly, thereby widening the distance between the steel trusses and the high-speed railway line. After assembly, the steel trusses are translated as a whole to the design position on one side of the high-speed railway line. The method of the present invention successfully solves the problem of assembling tall steel trusses adjacent to high-speed railways. While ensuring the operational safety of the high-speed railway line, it also ensures the construction period, completes the construction node goals with guaranteed quality, quantity, and safety, and has received unanimous praise from railway units and construction units, with significant social benefits.

Description

Technical Field

[0001] The present invention belongs to the technical field of bridge construction, and in particular relates to a method for assembling and translating tall steel trusses adjacent to a high-speed railway line out of position. Background Art

[0002] With the development and construction of cities and the increasing volume of traffic, the number of municipal road construction projects has also increased. This inevitably leads to the situation where municipal bridges intersect or run parallel to high-speed rail lines. Due to the special nature and importance of high-speed rail lines, the municipal bridge construction process must ensure the absolute safety of high-speed rail operations, which increases the risk and difficulty of normal construction. In particular, for projects where upper reinforced steel truss bridges are constructed parallel to high-speed rail lines, due to their high height, large span, and close proximity to the high-speed rail lines, if conventional construction techniques are used, any falling objects or materials during the assembly process will directly affect the safe operation of high-speed trains. Furthermore, the entire construction period is long, the safety risks are high, and the impact is wide. Summary of the Invention

[0003] In order to solve the above problems, the purpose of the present invention is to provide a method for the out-of-situ assembly and translation into place of tall steel trusses adjacent to high-speed railway lines.

[0004] To achieve the above-mentioned object, the present invention provides a method for assembling and translating tall steel trusses adjacent to a high-speed railway line, comprising the following steps performed in sequence:

[0005] 1) First, in the steel truss bridge erection area next to the high-speed railway line, the bridge piers were constructed according to the design drawings, and the cushion stones were poured on the pier tops;

[0006] 2) A support system is set up at a site outside the steel truss bridge erection area and at a steel truss assembly area several tens of meters away from the high-speed rail line; the support system includes bored cast-in-place piles, steel pipe columns, sand boxes, cushion beams, cushion blocks, and distribution beams; multiple bored cast-in-place piles are spaced apart in the foundation soil; the upper end of each bored cast-in-place pile is connected to a steel pipe column; the upper end of each steel pipe column is sequentially provided with a sand box, cushion beam, cushion block, and distribution beam from bottom to top;

[0007] 3) A transverse slideway system is set up in the support system and on the site between the piers: the transverse slideway system is composed of multiple transverse slideways spaced apart in the gaps within the support system and between the piers; each transverse slideway includes a pile foundation, a cap, a column steel pipe, a slideway beam, an MGE slider, an upper sliding shoe, and a scissor brace; four pile foundations are set in a group in a square shape in the foundation soil, a cap is set on the top of each group of pile foundations, the top surface of the cap is flush with the ground, and multiple caps are set at intervals along the translation direction; each cap Two column steel pipes are arranged side by side on the top surface; two adjacent caps form a group, and a scissor brace is placed between the two column steel pipes located at the same position in the same group; a slide beam is set at the upper end of all column steel pipes, and its length is equal to the sum of the widths of the steel truss bridge erection area and the steel truss assembly area. An upper sliding shoe is set on both sides of the top surface of the slide beam in the steel truss assembly area through an MGE slider for welding steel truss members; and the overall height of the transverse slide system is the same as that of the support system;

[0008] 4) Perform off-site assembly of the steel truss at the upper end of the transverse slideway system and support system within the steel truss assembly area: Use a gantry crane to assemble starting from the middle pier toward both sides, completing the assembly symmetrically in the order of lower chord → deck → straight web → diagonal web → upper chord → flat joint → cantilever; then, from the main pier, complete the assembly of the stiffening chord symmetrically in the order of straight web → stiffening chord diagonal web → stiffening chord, and simultaneously install the supports, thus completing the assembly of the entire steel truss;

[0009] 5) Dismantle the support system: After the steel truss is assembled, all the sand boxes and the components on the support system are removed, so that the steel truss is loaded by the traverse slide system alone instead of being loaded by the support system and the traverse slide system together;

[0010] 6) A translational traction system is installed on the slide beam of each transverse slideway: each translational traction system includes a towing cable, a reaction seat, and two jacking jacks; two jacking jacks are installed side by side on the top surface of each slide beam near the high-speed rail line end as traction power; a reaction seat is installed on the top surface of the slide beam located inside the jacking jack, and the jacking jack supports the reaction seat; a bundle of towing cables is connected to each jack, and the outer end of the towing cable is fixed to the pre-buried anchor point of the upper sliding shoe on the side of the transverse slideway near the high-speed rail line;

[0011] 7) Use the translation traction system to perform translation construction on the steel truss: Use the jacking jack to pull the towing cable to pull the steel truss along the slideway beam to the designed position of the steel truss bridge erection area, and remove the translation traction system;

[0012] 8) Lowering the beam and connecting the steel truss to the pier: Use multiple lifting jacks to lift the steel truss, then remove all the upper sliding shoes and MGE sliders in the transverse slideway system. Then, lower the beam by 1 cm each time until the support on the steel truss falls on the pad stone of the pier. Install the support lower bolts and pour grouting material. After the curing period, finally remove the transverse slideway system, thus completing the entire construction process.

[0013] In step 2), the diameter of the bored pile is 1250 mm; the size of the steel pipe column is φ800×16 mm; the diameter of the sand box is 800 mm; the size of the cushion beam is 1200×750×350 mm; the size of the cushion block is 750×400×300 mm; the size of the distribution beam is 1400×600×500 mm; and it is 15 m away from the high-speed rail line.

[0014] In step 3), the transverse slide system consists of four transverse slides; the diameter of the pile foundation is 1m; the size of the base is 4.5m*4.5m*1.5m; the size of the column steel pipe is φ1020*20mm; the size of the scissors support is φ325*8mm; the slide beam is a steel box structure, 2.4m high, 2.4m wide, and 47m long, and a stainless steel plate is laid on the top surface.

[0015] In step 6), the pushing jack is a 200t jack.

[0016] In step 8), the lifting jacks used are 16 800t jacks.

[0017] The method for dislocation assembly and translation of tall steel trusses adjacent to high-speed rail lines provided by the present invention has the following advantages: the steel trusses are moved a certain distance away from the original design position to the outside of the high-speed rail line for assembly, thereby increasing the distance between the steel trusses and the high-speed rail line. After assembly, the steel trusses are translated as a whole to the design position on the side of the high-speed rail line. Utilizing the method of the present invention, the difficult problem of assembling tall steel trusses adjacent to high-speed rail lines is successfully solved. While ensuring the safe operation of the high-speed rail line, the construction period is guaranteed, and the construction node goals are completed with guaranteed quality, quantity, and safety. This method has been unanimously praised by railway units and construction units, and has significant social benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is the general layout diagram of the steel truss in the present invention.

[0019] Figure 2 This is a cross-sectional layout diagram of a single pile of the support system in the present invention.

[0020] Figure 3 This is a cross-sectional layout diagram of the transverse slide system in the present invention.

[0021] Figure 4This is a vertical layout diagram of the translation traction system in the present invention. DETAILED DESCRIPTION

[0022] The following is a detailed description of the method for assembling and moving a tall steel truss beam adjacent to a high-speed railway line in a different location provided by the present invention in conjunction with the accompanying drawings and specific embodiments. The following embodiments are used to illustrate the present invention but are not intended to limit the scope of the present invention.

[0023] Now let's take a bridge project as an example to illustrate: the (119+138)m upper reinforced steel truss on the high-speed railway side of the project is assembled parallel to the existing Beijing-Shanghai High-Speed Railway. The edge of the beam is 17m away from the Beijing-Shanghai High-Speed Railway fence and 28m away from the fourth track of the Beijing-Shanghai High-Speed Railway, while the highest point of the bridge structure is 59m from the ground. The beam is close to the high-speed railway line, and the construction poses a great threat to the safety of the high-speed railway. Through the present invention, the problem of assembling tall steel trusses adjacent to the high-speed railway is successfully solved. While ensuring the operational safety of the Beijing-Shanghai High-Speed Railway, the construction period is also guaranteed. The construction node goals are completed with quality, quantity and safety guaranteed, which has been unanimously praised by the railway unit and the construction unit, and has significant social benefits.

[0024] The construction process of the out-of-position assembly and translational placement construction method of tall steel trusses adjacent to high-speed railway lines provided by the present invention is described as follows:

[0025] The span of the steel truss girder adjacent to the Beijing-Shanghai High-Speed Railway is (119+138)m, with a deck width of 32.2m, a structural height of 42m, and a highest point of 59m from the ground. The designed edge of the girder is 2m from the Beijing-Shanghai High-Speed Railway fence and 12.9m from the center of the four tracks. During assembly, the girder was pre-biased 15m away from the railway (a maximum limit of 15m was imposed due to the influence of surrounding roads and residential areas). After assembly, the support system at the bottom of the girder was removed, and the steel truss was supported by four transverse slideways. These slideways then helped to shift the girder 15m toward the railway to its designed position. The girder was then lowered, the translational traction system removed, and the girder connected to the main pier, completing the assembly of the steel truss girder adjacent to the high-speed railway.

[0026] like Figures 1 to 4 As shown, the method for assembling and moving tall steel trusses adjacent to a high-speed railway line provided by the present invention comprises the following steps performed in sequence:

[0027] 1) First, in the steel truss bridge erection area next to the high-speed railway line, the bridge piers were constructed according to the design drawings, and the cushion stones were poured on the pier tops;

[0028] 2) A support system is set up at a site in a steel truss assembly area outside the steel truss bridge erection area and tens of meters away from the high-speed rail line; the support system includes bored cast-in-place piles 1, steel pipe columns 2, sand boxes 3, cushion beams 4, pads 5, and distribution beams 6; multiple bored cast-in-place piles 1 are spaced apart in the foundation soil; the upper end of each bored cast-in-place pile 1 is connected to a steel pipe column 2; the upper end of each steel pipe column 2 is sequentially set with a sand box 3, cushion beam 4, pad 5, and distribution beam 6 from bottom to top;

[0029] In this embodiment, the diameter of the bored pile 1 is 1250 mm; the size of the steel pipe column 2 is φ800×16 mm; the diameter of the sand box 3 is 800 mm; the size of the cushion beam 4 is 1200×750×350 mm; the size of the cushion block 5 is 750×400×300 mm; the size of the distribution beam 6 is 1400×600×500 mm; and it is 15 m away from the high-speed rail line.

[0030] 3) A transverse slideway system is set up in the support system and on the ground between the piers: the transverse slideway system is composed of multiple transverse slideways spaced apart in the gaps within the support system and between the piers; each transverse slideway includes a pile foundation 7, a cap 8, a column steel pipe 9, a slideway beam 10, an MGE slider 11, an upper sliding shoe 12, and a scissor brace 13; four pile foundations 7 are set in a group in a square shape in the foundation soil, a cap 8 is set on the top of each group of pile foundations 7, the top surface of the cap 8 is flush with the ground, and multiple caps 8 are set at intervals along the translation direction; each cap Two column steel pipes 9 are arranged side by side on the top surface of 8; two adjacent caps 8 form a group, and a scissor brace 13 is provided between the two column steel pipes 9 located at the same position in the same group; a slide beam 10 is provided at the upper end of all column steel pipes 9, and its length is equal to the sum of the widths of the steel truss bridge erection area and the steel truss assembly area. An upper sliding shoe 12 is provided on both sides of the top surface of the slide beam 10 located in the steel truss assembly area through an MGE slider 11 for welding the steel truss members; and the overall height of the transverse slide system is the same as that of the support system;

[0031] In this embodiment, the transverse slide system is composed of four transverse slides; the diameter of the pile foundation 7 is 1m; the size of the base 8 is 4.5m*4.5m*1.5m; the size of the column steel pipe 9 is φ1020*20mm; the size of the scissors support 13 is φ325*8mm; the slide beam 10 is a steel box structure, 2.4m high, 2.4m wide, and 47m long, and a stainless steel plate is laid on the top surface.

[0032] 4) Performing off-site assembly of the steel truss 17 at the upper end of the transverse slideway system and the support system within the steel truss assembly area: Using a gantry crane, assembling is performed starting from the middle pier toward both sides, symmetrically following the order of lower chord → bridge deck → straight web → diagonal web → upper chord → flat joint → cantilever; then, symmetrically assembling the stiffening chords from the main pier in the order of straight web → stiffening chord diagonal web → stiffening chord, and simultaneously installing the supports, thereby completing the assembly of the entire steel truss 17;

[0033] 5) Dismantle the support system: After the steel truss 17 is assembled, all the sand boxes 3 and the components thereon in the support system are removed, so that the steel truss is loaded by the traverse slide system alone instead of being loaded by the support system and the traverse slide system together;

[0034] 6) A translation traction system is installed on the slide beam 10 of each transverse slideway: each translation traction system includes a towing cable 14, a reaction seat 15, and two jacking jacks 16; two jacking jacks 16 are installed side by side on the top surface of each slide beam 10 near the high-speed rail line end as traction power; a reaction seat 15 is installed on the top surface of the slide beam 10 located inside the jacking jack 16, and the jacking jack 16 supports the reaction seat 15; a bundle of towing cables 14 is connected to each jack 16, and the outer end of the towing cable 14 is fixed to the pre-buried anchor point of the upper sliding shoe 12 on the side of the transverse slideway near the high-speed rail line;

[0035] In this embodiment, the pushing jack 16 is a 200t jack.

[0036] 7) Use the translation traction system to perform translation construction on the steel truss 17: Use the jacking jack 16 to pull the towing cable 14 to pull the steel truss 17 along the slideway beam 10 to the designed position of the steel truss bridge erection area, and remove the translation traction system;

[0037] 8) Lowering the beam and connecting the steel truss 17 to the pier: Use multiple lifting jacks to lift the steel truss 17, then remove all the upper sliding shoes 12 and MGE sliders 11 in the transverse slideway system. Then, lower the beam 17 by 1 cm each time until the support on the steel truss 17 rests on the pier pad. Install the support lower bolts and pour grout. After the curing period, finally remove the transverse slideway system, thus completing the entire construction process.

[0038] In this embodiment, the lifting jacks are 16 800t jacks.

Claims

1. A method for assembling and moving tall steel trusses adjacent to a high-speed railway line out of position, characterized by: The construction method comprises the following steps performed in sequence: 1) First, in the steel truss bridge erection area next to the high-speed railway line, the bridge piers were constructed according to the design drawings, and the cushion stones were poured on the pier tops; 2) A support system is set up on a site of a steel truss assembly area outside a steel truss bridge erection area and several tens of meters away from a high-speed railway line; the support system comprises bored cast-in-place piles (1), steel pipe columns (2), sand boxes (3), cushion beams (4), cushion blocks (5) and distribution beams (6); a plurality of bored cast-in-place piles (1) are arranged at intervals in foundation soil; the upper end of each bored cast-in-place pile (1) is connected to a steel pipe column (2); the upper end of each steel pipe column (2) is sequentially provided with a sand box (3), cushion beam (4), cushion block (5) and distribution beam (6) from bottom to top; 3) A transverse slideway system is set up in the support system and on the site between the piers: the transverse slideway system is composed of multiple transverse slideways arranged at intervals in the gaps within the support system and between the piers; each transverse slideway includes a pile foundation (7), a cap (8), a column steel pipe (9), a slideway beam (10), an MGE slider (11), an upper sliding shoe (12) and a scissor brace (13); four pile foundations (7) are arranged in a square shape in the foundation soil, and a cap (8) is set on the top of each group of pile foundations (7), the top surface of the cap (8) is flush with the ground, and multiple caps (8) are arranged at intervals along the translation direction; each Two column steel pipes (9) are arranged side by side on the top surface of the pedestal (8); two adjacent pedestals (8) form a group, and a scissor brace (13) is provided between the two column steel pipes (9) at the same position in the same group; a slideway beam (10) is provided at the upper end of all column steel pipes (9), and its length is equal to the sum of the widths of the steel truss bridge erection area and the steel truss assembly area; an upper sliding shoe (12) is provided on both sides of the top surface of the slideway beam (10) located in the steel truss assembly area through an MGE slider (11) for welding the steel truss rods; and the overall height of the transverse slideway system is the same as that of the bracket system; 4) The steel truss (17) is assembled out of position at the upper end of the transverse slideway system and the bracket system in the steel truss assembly area: a gantry crane is used to assemble the steel truss (17) starting from the middle pier to both sides, and the assembly is completed symmetrically in the order of lower chord → bridge deck → straight web → diagonal web → upper chord → flat joint → cantilever; then, the stiffening chord is assembled symmetrically in the order of stiffening chord straight web → stiffening chord diagonal web → stiffening chord from the main pier position, and the support is installed at the same time, thereby completing the assembly of the entire steel truss (17); 5) Dismantling the support system: After the steel truss (17) is assembled, all the sand boxes (3) in the support system and the components thereon are dismantled, so that the steel truss is loaded not by the support system and the transverse slide system but by the transverse slide system alone; 6) A translation traction system is provided on the slide beam (10) of each transverse slideway: each translation traction system includes a towing cable (14), a reaction seat (15) and two jacking jacks (16); two jacking jacks (16) are provided side by side on the top surface of each slide beam (10) near one end of the high-speed railway line as traction power; a reaction seat (15) is installed on the top surface of the slide beam (10) located inside the jacking jack (16), and the jacking jack (16) supports the reaction seat (15); a bundle of towing cables (14) is connected to each jack (16), and the outer end of the towing cable (14) is fixed to a pre-buried anchor point of the upper sliding shoe (12) on the transverse slideway near the high-speed railway line; 7) Using the translation traction system to perform translation construction on the steel truss (17): by pulling the towing cable (14) through the jacking jack (16), the steel truss (17) is pulled along the slideway beam (10) to the designed position of the steel truss bridge erection area, and the translation traction system is removed; 8) Lowering the beam and connecting the steel truss (17) to the pier: Use multiple lifting jacks to lift the steel truss (17), then remove all the upper sliding shoes (12) and MGE sliders (11) in the transverse slideway system, and then control the lifting and lowering by 1 cm each time until the support on the steel truss (17) falls on the pad stone of the pier, install the support lower bolts, pour grouting material, and after the curing period, finally remove the transverse slideway system, thus completing the entire construction process.

2. The method for assembling and moving tall steel trusses adjacent to a high-speed railway line according to claim 1 is characterized in that: In step 2), the diameter of the bored pile (1) is 1250 mm; the size of the steel pipe column (2) is φ800×16 mm; the diameter of the sand box (3) is 800 mm; the size of the cushion beam (4) is 1200×750×350 mm; the size of the cushion block (5) is 750×400×300 mm; the size of the distribution beam (6) is 1400×600×500 mm; and the distance from the high-speed rail line is 15 m.

3. The method for assembling and moving tall steel trusses adjacent to a high-speed railway line according to claim 1 is characterized in that: In step 3), the transverse slide system consists of four transverse slides; the diameter of the pile foundation (7) is 1m; the size of the base (8) is 4.5m*4.5m*1.5m; the size of the column steel pipe (9) is φ1020*20mm; the size of the scissors support (13) is φ325*8mm; the slide beam (10) is a steel box structure, 2.4m high, 2.4m wide, and 47m long, and a stainless steel plate is laid on the top surface.

4. The method for assembling and moving tall steel trusses adjacent to a high-speed railway line according to claim 1 is characterized in that: In step 6), the pushing jack (16) is a 200t jack.

5. The method for assembling and moving tall steel trusses adjacent to a high-speed railway line according to claim 1 is characterized in that: In step 8), the lifting jacks used are 16 800t jacks.

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