Crossing existing line door type pier cap beam construction platform and installation method thereof

Abstract

The application discloses a kind of across existing line portal pier deck beam construction platform and its installation method, including double-layer bailey beam component;Double-layer bailey beam component includes two bailey beam assemblies erected in the transverse direction of main crossbeam at the both ends of main crossbeam, bailey beam assembly is oppositely spaced;Located in the lower layer of double-layer bailey beam component is provided with installation platform, and the lower layer main protective shed frame is arranged between the two bailey beam assemblies on installation platform, and the lower layer walking platform and the lower layer side protective shed frame are arranged outside the two bailey beam assemblies on installation platform;Located in the middle layer of double-layer bailey beam component is provided with middle layer support platform, and middle layer support platform is between the two bailey beam assemblies;Located in the upper layer of double-layer bailey beam component, upper layer walking platform and upper layer protective shed frame are respectively arranged at the upper end of the two bailey beam assemblies.Using protective structure composed of double-layer bailey frame component, the problem existing in deck beam support and protection in the construction of across existing line deck beam is well solved.

Description

Technical Field

[0001] This invention belongs to the field of road and bridge construction technology, specifically relating to a construction platform for a portal pier cap beam spanning an existing railway line and its installation method. Background Technology

[0002] Currently, there are more and more bridge projects in China that use portal pier cap beams for overpasses. During the construction of the cap beam support in the overpass area, due to the proximity to the operating line, steel columns cannot be set in the middle of the span during construction, so multi-span steel support systems cannot be used. This has caused great difficulties for the construction of large-span portal pier cap beams across existing lines.

[0003] Because the construction crosses an existing power line, the protection level required during construction is extremely high to ensure the normal and safe operation of the existing line, requiring a completely waterproof level. Furthermore, the close proximity of the bottom of the construction cap beam to the high-voltage live parts of the existing line makes it impossible to erect a separate protective scaffold during actual protection construction, all of which significantly complicate the cap beam construction. Summary of the Invention

[0004] The purpose of this invention is to provide a construction platform for portal pier cap beams spanning existing railway lines and its installation method, so as to solve the above-mentioned technical problems in the construction of portal pier cap beams spanning subway and high-speed rail lines.

[0005] This invention is achieved through the following technical solution: Construction platform for portal pier cap beams spanning existing railway lines, including double-layer Bailey beam components; The double-layer Bailey beam component includes two Bailey beam assemblies erected at both ends of the main crossbeam along the transverse direction of the main crossbeam, and the Bailey beam assemblies are arranged at intervals relative to each other. An installation platform is provided on the lower layer of the double-layer Bailey beam component. A lower main protective canopy is provided on the installation platform between the two sets of Bailey beam components. A lower walking platform and a lower side protective canopy are provided on the installation platform outside the two sets of Bailey beam components. A middle-layer support platform is provided in the middle layer of the double-layer Bailey beam component, and the middle-layer support platform is located between the two sets of Bailey beam components.

[0006] In some embodiments, the installation platform consists of a plurality of installation distribution beams that pass through the gaps in the lower truss along the transverse direction of the double-layer Bailey beam member. The installation distribution beams are arranged sequentially along the longitudinal direction of the double-layer Bailey beam member and pass between the two sets of Bailey beam assemblies, with both ends of the installation distribution beams extending outward from the outer side of the Bailey beam assembly.

[0007] In some embodiments, the middle support platform consists of a plurality of main distribution beams that pass through the gaps in the middle truss along the transverse direction of the double-layer Bailey beam members. The main distribution beams are arranged sequentially along the longitudinal direction of the double-layer Bailey beam members and pass between the two sets of Bailey beam components.

[0008] In some embodiments, the lower main protective canopy and the lower side protective canopy are constructed using aluminum formwork.

[0009] In some embodiments, an upper walking platform and an upper protective canopy are respectively provided at the upper ends of the two sets of Bailey beam components, located on the upper layer of the double-layer Bailey beam components.

[0010] In some embodiments, the upper protective canopy is constructed using aluminum formwork.

[0011] In some embodiments, the Bailey beam assembly includes an upper Bailey beam and a lower Bailey beam stacked together.

[0012] In some embodiments, the upper Bailey beam and the lower Bailey beam comprise two Bailey frames arranged side by side.

[0013] On the other hand, this invention also relates to a method for installing a construction platform for a portal pier cap beam spanning an existing railway line, comprising the following steps: S1. The assembled Bailey bridge is hoisted and installed at both ends of the main crossbeam. Two sets of Bailey beam components are erected at both ends of the main crossbeam to form a double-layer Bailey beam component. S2. Install the installation distribution beam through the gap of the lower truss of the double-layer Bailey beam component, and install the installation distribution beam through the two Bailey beam components in sequence to form an installation platform in the lower layer of the double-layer Bailey beam component. On the installation platform, the lower main protective shed is erected between the two sets of Bailey beam components. On the installation platform, the lower walking platform and the lower side protective shed are erected outside the Bailey beam components. S3. A main distribution beam is installed in the gap between the middle trusses of the double-layer Bailey beam members. The main distribution beam is installed sequentially between the two Bailey beam members, and the main distribution beam forms a middle support platform between the two Bailey beam members. S4. On the upper layer of the double-layer Bailey beam components, an upper-level walking platform and an upper-level protective canopy are respectively erected at the upper ends of the two sets of Bailey beam components.

[0014] Compared with the prior art, the present invention has the following advantages and beneficial effects: The construction platform of this invention adopts a protective structure composed of double-layer Bailey beam components, which is convenient for construction and installation. By constructing a middle-layer support platform in the middle of the double-layer Bailey beam components, the load point of the cap beam is adjusted to the middle of the Bailey beam support system. While ensuring the strength of the large-span Bailey beam support, space is left for the erection of the upper and lower protective sheds, thus effectively solving the problems existing in the support and protection of cap beams in the construction of cap beams across existing lines.

[0015] During the installation and construction of the construction platform of this invention, based on the structural characteristics of the double-layer Bailey beam components, the entire construction platform and protective scaffolding are easy to erect and operate. While providing a foundation for the cap beam construction, the construction platform also provides space and a platform for construction personnel to operate, which facilitates the entire cap beam construction operation and ensures safety during the construction process and the normal operation of the existing line. Attached Figure Description

[0016] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings in the embodiments will be briefly described below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of one embodiment of the portal pier cap beam construction platform of the present invention.

[0018] Figure 2 Left view of one embodiment of the portal pier cap beam construction platform of the present invention. Figure 3 This is a schematic diagram of another embodiment of the portal pier cap beam construction platform of the present invention.

[0019] Figure 4 This is a left structural view of another embodiment of the portal pier cap beam construction platform of the present invention.

[0020] Figure 5 This is a schematic diagram of the installation status of the portal pier cap beam construction platform for the present invention.

[0021] Figure 6 This is a schematic diagram of the steel reinforcement skeleton structure for hoisting the cap beam on the construction platform of the portal pier cap beam spanning an existing railway line, according to the present invention.

[0022] Figure 7 This is a schematic diagram of the dismantling process of the construction platform for the portal pier cap beam spanning an existing railway line in this invention.

[0023] Figure 8 This is a schematic diagram of the top hoisting support structure in this invention.

[0024] in: 1. Construction platform; 2. Pier body; 3. Steel pipe column support; 4. Sand box; 6. Reinforcing steel skeleton of cap beam; 7. Cap beam. 10. Bailey beam assembly; 101. Upper Bailey beam; 102. Lower Bailey beam; 11. Lower walking platform; 12. Lower main protective canopy; 13. Lower side protective canopy; 14. Upper walking platform; 15. Upper protective canopy. 21. Main crossbeam; 22. Main distribution beam; 23. Installation distribution beam; 31. Base template; 41. Top hoisting support. Detailed Implementation

[0025] 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 some embodiments of the present invention, but not all embodiments.

[0026] In the construction of portal pier cap beams spanning existing railway lines, this invention adopts a mid-span double-layer reinforced Bailey beam structure to adjust the load point of the cap beam to the middle of the Bailey beam. This ensures the strength of the large-span Bailey beam support while leaving space for the erection of protective scaffolding, providing a foundation for the good integration of the protective scaffolding and support system. This effectively solves the problems existing in support and protection during cap beam construction.

[0027] The protective platform uses aluminum formwork as the protective material for the protective scaffold, forming a fully enclosed protective scaffold. This effectively solves the problems of insufficient protective capacity of wooden formwork and heavy self-weight of steel formwork, providing a reliable guarantee for the safety of the cap beam construction.

[0028] Reference Figure 1 , Figure 2 , Figure 3 and Figure 4 The construction platform 1 for the portal pier cap beam across the existing line in this embodiment includes a double-layer Bailey beam component. The double-layer Bailey beam component includes two Bailey beam assemblies 11 erected at both ends of the main crossbeam along the transverse direction of the main crossbeam. The Bailey beam assemblies 11 are arranged at intervals relative to each other and are respectively located on both sides of the pier body. The Bailey beam assembly 11 includes an upper Bailey beam 101 and a lower Bailey beam 102 stacked together. The upper Bailey beam 101 and the lower Bailey beam 102 each include two Bailey frames arranged side by side.

[0029] An installation platform is provided on the lower layer of the double-layer Bailey beam component. A lower main protective canopy 12 is provided on the installation platform between the two sets of Bailey beam components. A lower walking platform 11 and a lower side protective canopy 13 are provided on the installation platform outside the two sets of Bailey beam components. Specifically, the installation platform consists of multiple installation distribution beams 23 that pass through the gaps in the lower truss along the transverse direction of the double-layer Bailey beam members. The multiple installation distribution beams 23 are arranged sequentially along the longitudinal direction of the double-layer Bailey beam members and pass between the two sets of Bailey beam components. Both ends of the installation distribution beams 23 extend outward from the outer side of the Bailey beam components. A middle-layer support platform is provided in the middle layer of the double-layer Bailey beam component, and the middle-layer support platform is located between the two sets of Bailey beam components; Specifically, the middle support platform consists of multiple main distribution beams 22 that pass through the gaps in the middle truss along the transverse direction of the double-layer Bailey beam members. The main distribution beams 22 are arranged sequentially along the longitudinal direction of the double-layer Bailey beam members and pass between the two sets of Bailey beam components. Located on the upper layer of the double-layer Bailey beam components, an upper-layer walking platform 14 and an upper-layer protective canopy 15 are respectively provided on the upper end faces of the two sets of Bailey beam components 10.

[0030] On this construction platform, the upper protective canopy 15, the lower main protective canopy 12, and the lower side protective canopy 13 are constructed using aluminum formwork, which ensures both protective performance and structural strength.

[0031] The installation method of the support and protection platform in the above embodiments includes the following steps: S1. The assembled Bailey bridge is hoisted and installed at both ends of the main crossbeam. Two sets of Bailey beam components 10 are erected at both ends of the main crossbeam to form a double-layer Bailey beam component. S2. An installation distribution beam 23 is installed in the gap of the lower truss of the double-layer Bailey beam component. The installation distribution beam 23 is sequentially installed between the two Bailey beam components 10 to form an installation platform in the lower layer of the double-layer Bailey beam component. A lower main protective shed 12 is erected on the installation platform between the two sets of Bailey beam components. A lower walking platform 11 and a lower side protective shed 13 are erected on the installation platform outside the Bailey beam components. S3. A main distribution beam 22 is installed in the middle truss gap of the double-layer Bailey beam member (located above the lower Bailey beam, that is, the truss gap at the bottom of the upper Bailey beam). The main distribution beam 22 is installed sequentially between the two Bailey beam components, and the main distribution beam 22 forms a middle support platform between the two Bailey beam components. S4. On the upper layer of the double-layer Bailey beam component, an upper-level walking platform 14 and an upper-level protective canopy 15 are respectively erected on the upper end face of the two sets of Bailey beam components 10.

[0032] The following section uses the construction of a portal pier cap beam across an existing subway line as an example, and combines the construction process of the portal pier cap beam across the existing subway line to provide a detailed explanation of the construction platform for the portal pier cap beam across an existing subway line and its installation method.

[0033] 1. Foundation construction Rotary drilling rigs are used for pile foundation construction. After the pile foundation construction is completed, the pile heads are removed, the pile cap reinforcement is tied, steel column base connecting reinforcement is pre-embedded on the pile cap, and the pile cap concrete is poured.

[0034] 2. Construction of Pier 2 After the foundation concrete is poured, the pier reinforcement is tied. The portal pier adopts a segmented construction method, with each segment being 8m high. The construction is divided into 3 segments. When the reinforcement is tied to the segment division point, steel columns are pre-embedded in the pier body to connect the columns with steel plates, and then the pier body concrete is poured.

[0035] 3. Installation of steel pipe column support 3 The lower part of the Bailey bridge uses φ609mm steel pipe columns with a wall thickness of 16mm as supporting columns. The steel pipe columns are erected to support the load and transfer it to the pile platform, and then from the pile platform to the pile foundation. To ensure that the steel pipe columns are subjected to uniform and balanced stress and that they stand vertically on the rectangular foundation, the inclination of the steel pipe columns is no greater than 1 / 600, the deviation of a single segment is no greater than 10mm, and the deviation of the total height is no greater than 3.5mm.

[0036] Mark the location for the steel pipe column support on the top surface of the foundation, and pre-embed or install HRB400 18mm diameter steel bars and thread them for bolt connection (the pull-out resistance of the steel bars shall not be less than 60kN, the length of the steel bars anchored into the foundation shall not be less than 0.4m, and the exposed threads shall not be less than 2 threads).

[0037] After the steel pipe columns are hoisted into place by a truck crane, they are securely connected to the base flange with bolts. After the steel pipe columns are installed, lateral supports are welded to ensure the lateral stability of the steel pipe columns.

[0038] During the construction of the steel pipe columns, 16 C18 steel bars are installed at each column location, with an installation depth of not less than 0.4m. The top of the steel bars is wired and connected to the steel pipe column flange via sleeves. The steel pipe columns are arranged in four rows along the pier body, with three columns per row on the side closest to the existing power line, and the spacing between the steel pipe columns is 4.301m. During installation, steel wedges are used to fine-tune the verticality of the steel pipe columns, ensuring that their verticality meets the specification requirement of 1 / 600. Finally, grout is applied to the column base, and the connecting sleeves are tightened.

[0039] The steel pipe columns are connected by [10 channel steel ear plates. The [10 channel steel is welded into a truss structure, hoisted to the welding position, and connected to the pre-embedded steel plate of the pier body. A connection is made every 6m.

[0040] 4. Sandbox 4 Installation After the steel pipe columns are installed, an unloading device is installed between the beams and the columns to facilitate the later removal of the steel pipe supports. The unloading device uses a 40cm high sand box. Before installation, the sand box is pre-compressed to eliminate uneven settlement caused by the sand box during concrete pouring.

[0041] A 40cm high sand box is installed on top of a steel pipe column support via its flange connection. The flange connection between the steel pipe column and the sand box ensures that the center line of the sand cylinder in the sand box is aligned with the center line of the steel pipe column. The height of the sand box is calculated according to the actual design requirements, ensuring the sand filling height within the sand cylinder is met.

[0042] 5. Installation of main crossbeam 21 The main crossbeam 21 is made of I56a I-beam, with a single length of 6m. It is reinforced by welding 2cm thick steel plates at the support points of the I56a I-beam, forming three ribs at each support point. After welding, Bailey bridge beam limiting U-shaped clips are welded onto the main crossbeam.

[0043] The installation positions of each Bailey bridge frame are marked on the main crossbeam 21. One or two I56a I-beams are joined together (intermittent spot welding) to form a whole, and then hoisted to the top of the sand box and installed in place.

[0044] 6. Installation of construction platform 1 for portal pier cap beam across existing railway line 6.1 Installation of Double-Layer Bailey Beam Components When assembling the Bailey bridge, first install the middle Bailey section, and then install the sections symmetrically from the middle outwards. The dimensions of the Bailey section are 27×3.2×0.45.

[0045] After the Bailey bridge is installed, it is connected to a flower rack to form a whole, thereby increasing the overall stability.

[0046] The Bailey panels are assembled on the bottom surface into a single long beam, with three panels per group, and the Bailey frames are connected into a whole by a crossbeam.

[0047] After assembly, double-layered [10 channel steel is welded at the support point where the Bailey beam contacts the main crossbeam to reinforce the vertical members and ensure the local stability of the Bailey beam support point.

[0048] A double-layer Bailey beam component consists of 12 double-layer reinforced Bailey panels installed longitudinally, 6 on each side, with 3 panels connected by a decorative window. The installation positions of each Bailey frame group are marked on the main crossbeam according to the design spacing. A crane is used to hoist the connected Bailey frames into place in the order of first the middle, then the sides, and each Bailey frame is fixed to the main crossbeam using channel steel U-shaped clamps, completing the installation of the double-layer Bailey beam component. This double-layer Bailey beam component consists of two sets of Bailey beam assemblies 10 arranged at relatively intervals at both ends of the main crossbeam. Each Bailey beam assembly 10 includes an upper Bailey beam 101 and a lower Bailey beam 102 stacked together.

[0049] 6.2 Erection and installation of the lower-level protective scaffolding Reference Figure 5 Using a combination of manual labor and a truck crane, 40 I10 steel distribution beams, each 9m long, were used as installation distribution beams 23 and sequentially inserted into the gaps of the lower truss of the double-layer Bailey beam component. Two beams were laid in each truss gap, with a spacing of 30cm.

[0050] The I10 I-beam installation distribution beam 23 extends from both ends of the double-layer Bailey beam components. A lower main protective canopy 12 is erected on the installation distribution beam 23 between the two sets of Bailey beam components. A lower walking platform 11 and a lower side protective canopy 13 are erected at both ends of the installation distribution beam 23 extending outside the Bailey beam components. The lower main protective canopy 12, the lower side protective canopy 13, and the lower walking platform 11 together form the lower protective system, providing an operating platform and space for the installation of the entire supporting protective platform and the construction of the cap beam.

[0051] Specifically, aluminum formwork is erected on the installation distribution beams located between and on both sides of the two sets of Bailey beam components to form the lower protective scaffold. The use of aluminum formwork ensures the strength of the protective structure while also ensuring its sealing performance, achieving "no leakage" during construction.

[0052] The lower protective scaffolding uses 4mm thick aluminum formwork, which is connected by a socket and pin method. The smooth side of the aluminum formwork faces downwards, while the ribbed side faces upwards. The aluminum formwork is first pre-assembled in sections on the ground, each section being 3m long, and then hoisted and installed using a truck crane.

[0053] 6.3 Erection and installation of the intermediate support platform On the ground, the I25a main distribution beam 22 is processed by cutting the 12m steel section into two 6m long steel sections. The two steel sections are intermittently welded together to form the main distribution beam 22. The beam is inserted into the gap of the middle truss of the double-layer Bailey beam component by manual labor and a truck crane. A support platform is formed in the middle layer of the double-layer Bailey beam component, which serves as the load-bearing layer for the cap beam construction and is used to install the bottom formwork of the cap beam.

[0054] Specifically, multiple main distribution beams 22 are sequentially inserted between the two sets of Bailey beam assemblies 10 along the longitudinal direction of the double-layer Bailey beam assembly 10, thus forming a middle-layer support platform composed of the main distribution beams between the two sets of Bailey beam assemblies.

[0055] At this time, the middle support platform is located directly above the lower main protective scaffold. In this way, during the construction of the cap beam, the middle support platform provides a foundation for supporting the cap beam formwork system, while the lower main protective scaffold provides protection for the cap beam construction, ensuring that there is no water leakage during the construction process.

[0056] 6.4 Erection and installation of the upper protective scaffolding Upper walking platforms 14 are erected on the left and right sides of the upper layer of the double-layer Bailey beam component. Aluminum formwork is then erected on the upper walking platforms 14 to form an upper protective scaffold 15, thus forming an upper-level operational protection system. The upper walking platforms provide a platform and space for construction operations, including the construction of the cap beam and the installation of the cap beam formwork.

[0057] At this point, a fully enclosed support and protection platform is formed.

[0058] This support and protection platform provides a foundation for the subsequent installation of the cap beam formwork, and also provides operating space for the installation of the cap beam formwork. The fully enclosed structure formed by the aluminum formwork can effectively ensure that there is no water leakage during the construction of the cap beam, providing a reliable guarantee for the safety of the cap beam construction across the existing line.

[0059] 7. Installation of bottom formwork for the cap beam (31) The bottom formwork of the cap beam is laid on the middle support platform of the protective platform. The bottom formwork 31 is made of 8mm steel plate.

[0060] 8. Install the steel reinforcement cage for the cap beam. The installation of the cap beam reinforcement cage 6 involves fabricating the reinforcement cage as a whole on the ground, and then hoisting it onto the cap beam formwork as a whole, referring to... Figure 6 .

[0061] The steel reinforcement cage of the cap beam is fabricated on the ground and then hoisted into the cap beam formwork as a whole. This can effectively solve the problem of the construction cycle being affected by the limited window period during the construction of the existing line. As a result, the construction cycle can be greatly shortened without affecting the normal operation of the subway line.

[0062] Because the overall span of the cap beam reinforcement cage is large, it is easy for it to deform during the hoisting process. Once deformation occurs, it will affect the construction quality of the cap beam. Therefore, a special hoisting tool for the cap beam reinforcement cage has been made. Using this hoisting tool and hoisting method can effectively ensure that the cap beam reinforcement cage will not deform during the hoisting process.

[0063] 9. Installation of side formwork, end formwork, and top slab for the cap beam. After the steel reinforcement cage of the cap beam is tied on the construction platform, the side formwork, end formwork and top slab are installed, and the side formwork is reinforced with tie rods.

[0064] The side formwork is made of 6mm steel plate, and the side formwork frame is made of I12 and 12mm steel plates, with three I25a I-beams welded together.

[0065] The end formwork is made of 8mm steel plate, the frame is made of 160×80×5mm rectangular tube and 12mm steel plate, and the middle part of the cap beam formwork and the top plate are reinforced with φ25 precision rolled threaded steel for tie rods.

[0066] At this point, a cap beam formwork is erected within the middle support platform of the double-layer reinforced Bailey beam with a U-shaped frame structure, providing an operating platform for the installation of the cap beam formwork and providing effective protection for the cap beam construction through the double-layer reinforced Bailey beam structure.

[0067] 10. Concrete pouring The cap beam is made of C50 concrete and is poured in one go. The cap beam concrete must be poured within a 3-hour window period.

[0068] After the concrete is poured, the prestressed steel strands are installed.

[0069] 11. Dismantling of the construction platform On the upper walking platform of the double-layer Bailey beam component, remove the side formwork of the cap beam; A double-span I10 flat beam is installed at the top of the cap beam 7 to form a top hoisting support 41. φ25 precision-rolled threaded steel is used for temporary suspension of the bottom formwork of the cap beam, as per [reference needed]. Figure 7 and 8 ; The main crossbeam 21 is unloaded. The main crossbeam unloading operation is carried out from one end to the other. First, sand is released from the sand box. The sand release operation is carried out simultaneously to ensure that the main crossbeam is unloaded smoothly. Then, with the help of manual labor and machinery, the upper walking platform 14 and the upper protective canopy 15 are gradually dismantled. The I25a main distribution beam 22, which serves as the middle support platform, is pulled out from the side. The double-layer Bailey beam components are dismantled from the middle, the bolt connection between the upper and lower Bailey beams is released, the upper Bailey beam 101 is removed, and the lower Bailey beam 102 is retained. On the upper end face of the lower Bailey beam 102, an I10 support distribution beam is installed below the bottom formwork to form a bottom formwork dismantling platform, creating a space for dismantling the bottom formwork between the bottom formwork dismantling platform and the bottom formwork of the cap beam.

[0070] The suspended bottom formwork of the cap beam is lowered onto the bottom formwork dismantling platform. Then, with the help of manual labor and machinery, the bottom formwork is gradually pulled out from the side to complete the dismantling of the bottom formwork of the cap beam.

[0071] Remove the I10 support distribution beam, the lower protective shed, and the I10 I-beam installation distribution beam used to support the lower protective shed. Finally, remove the lower Bailey beams on both sides to complete the demolition of the construction platform. Then, the I56a main beam, sandbox, and steel pipe column support were removed in sequence.

[0072] Compared with the traditional cast-in-place cap beam construction process, the use of this construction platform and method during cap beam construction can ensure that there is no water leakage during the construction process, and greatly shorten the construction period and save costs. Taking the construction of three cap beams that cross the existing subway line in a rail transit project as an example, the use of this construction method saved 48 days of construction time and more than 1 million yuan in costs, achieving good economic and social benefits.

[0073] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., used to indicate the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship that the product of this invention is usually placed in during use. They are only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0074] Furthermore, the use of terms such as "horizontal" and "vertical" in the description of this invention does not imply that the components are required to be absolutely horizontal or suspended, but rather that they can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0075] In the description of this invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0076] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Any simple modifications or equivalent changes made to the above embodiments based on the technical essence of the present invention shall fall within the protection scope of the present invention.

Claims

1. A portal pier deck beam construction platform across an existing line, characterized in that, Including double-layer Bailey beam components; The double-layer Bailey beam component includes two Bailey beam assemblies erected at both ends of the main crossbeam along the transverse direction of the main crossbeam. The Bailey beam assemblies are arranged at intervals relative to each other, and the Bailey beam assembly includes an upper Bailey beam and a lower Bailey beam stacked together. An installation platform is provided on the lower layer of the double-layer Bailey beam member. A lower main protective canopy is provided on the installation platform between the two sets of Bailey beam components. A lower walking platform and a lower side protective canopy are provided on the installation platform outside the two sets of Bailey beam components. The installation platform is composed of multiple installation distribution beams that pass through the gaps in the lower truss along the transverse direction of the double-layer Bailey beam member. The installation distribution beams are arranged sequentially along the longitudinal direction of the double-layer Bailey beam member and pass through the gaps between the two sets of Bailey beam components. Both ends of the installation distribution beams extend outward from the outer side of the Bailey beam components. A middle-layer support platform is provided in the middle layer of the double-layer Bailey beam member. The middle-layer support platform is located between the two sets of Bailey beam components. The middle-layer support platform is composed of multiple main distribution beams that are sequentially inserted into the gaps of the middle-layer trusses along the transverse direction of the double-layer Bailey beam member. The main distribution beams are sequentially arranged along the longitudinal direction of the double-layer Bailey beam member and are inserted between the two sets of Bailey beam components. Located on the upper layer of the double-layer Bailey beam components, an upper-layer walking platform and an upper-layer protective canopy are respectively installed at the upper ends of the two sets of Bailey beam components.

2. The construction platform for the portal pier cap beam across an existing railway line according to claim 1, characterized in that, The lower main protective canopy and the lower side protective canopy are constructed using aluminum formwork.

3. The construction platform for the portal pier cap beam across an existing railway line according to claim 1, characterized in that, The upper protective canopy is constructed using aluminum formwork.

4. The construction platform for the portal pier cap beam across an existing railway line according to claim 1, characterized in that, The Bailey beam assembly includes an upper Bailey beam and a lower Bailey beam stacked together.

5. The construction platform for the portal pier cap beam across an existing railway line according to claim 4, characterized in that, The upper Bailey beam and the lower Bailey beam consist of two Bailey frames arranged side by side.

6. The installation method of the portal pier cap beam construction platform for crossing existing railway lines as described in any one of claims 1-5, characterized in that, Includes the following steps: S1. The assembled Bailey bridge is hoisted and installed at both ends of the main crossbeam. Two sets of Bailey beam components are erected at both ends of the main crossbeam to form a double-layer Bailey beam component. S2. Install the installation distribution beam through the gap of the lower truss of the double-layer Bailey beam component, and install the installation distribution beam through the two Bailey beam components in sequence to form an installation platform in the lower layer of the double-layer Bailey beam component. On the installation platform, the lower main protective shed is erected between the two sets of Bailey beam components. On the installation platform, the lower walking platform and the lower side protective shed are erected outside the Bailey beam components. S3. A main distribution beam is installed in the gap between the middle trusses of the double-layer Bailey beam members. The main distribution beam is installed sequentially between the two Bailey beam members, and the main distribution beam forms a middle support platform between the two Bailey beam members. S4. On the upper layer of the double-layer Bailey beam components, an upper-level walking platform and an upper-level protective canopy are respectively erected at the upper ends of the two sets of Bailey beam components.

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