Cable-stayed bridge cantilever prefabricated slab laying method and cable-stayed bridge structure

Abstract

The invention discloses a cable-stayed bridge cantilever precast slab laying method and a cable-stayed bridge structure, and relates to the field of cable-stayed bridge construction.The cable-stayed bridge cantilever precast slab laying method comprises the steps that a top longitudinal beam above a target steel truss girder is kept in a disconnected state, a temporary support is arranged below the separation position of the top longitudinal beam, and precast slabs are laid above all the steel truss girders; hoisting the target steel truss girder and the prefabricated slab above the steel truss girder adjacent to the target steel truss girder, lifting a lifting fulcrum located at the pier top of the auxiliary pier to support the target steel truss girder, connecting a top longitudinal beam above the target steel truss girder, and removing the temporary support; the hoisted prefabricated slabs are placed to the original positions, all the adjacent prefabricated slabs are subjected to wet connection, and lifting fulcrums are replaced with formal supports; wherein the target steel truss girder is a steel truss girder located above the auxiliary pier. The overall rigidity of the structure is improved when the precast slabs are laid, and construction risks are reduced.

Description

Technical Field

[0001] The invention relates to the field of cable-stayed bridge construction, and in particular to a method for laying a cantilever prefabricated slab of a cable-stayed bridge and a cable-stayed bridge structure. Background Art

[0002] After the steel trusses of the cable-stayed bridge are erected, in order to reduce the out-of-plane bending moment of the beams, the top longitudinal beams of the steel trusses at the top of the auxiliary piers are sometimes disconnected and not connected temporarily. This measure helps to optimize the overall stress state of the bridge and reduce the bending stress of the beams. However, after the top longitudinal beams are disconnected, the local stiffness of the bridge will be reduced, especially at the disconnection of the top longitudinal beams, where the bearing capacity drops significantly. When the subsequent plate erection machine is laying the entire bridge deck, the plate erection machine needs to step on the previous bridge deck panel to lay the next bridge deck panel. However, at this time, since the top longitudinal beam has been disconnected, if the plate erection machine is constructed directly on it, it may cause the steel truss plate at the disconnection to be overstressed, causing deformation or damage, posing a safety hazard. Summary of the invention

[0003] The present application provides a method for laying precast slabs of a cable-stayed bridge cantilever and a cable-stayed bridge structure, which can solve the technical problem existing in the prior art that in order to reduce the out-of-plane bending moment of the crossbeam, some steel truss longitudinal beams are disconnected in the cantilever of the cable-stayed bridge, resulting in a reduction in the local stiffness of the bridge, posing a safety hazard to the subsequent laying of the bridge deck.

[0004] In a first aspect, an embodiment of the present application provides a method for laying a cantilever prefabricated slab of a cable-stayed bridge, comprising:

[0005] Keep the top longitudinal beam above the target steel truss in a disconnected state, set up temporary supports below the separation of the top longitudinal beam, and lay precast panels above all steel trusses;

[0006] Lift the target steel truss and the precast panels above the steel trusses adjacent to the target steel truss, raise the lifting fulcrum located on the top of the auxiliary pier to support the target steel truss, connect the top longitudinal beam above the target steel truss, and remove the temporary support;

[0007] Place the lifted precast panels to their original positions, wet-join all adjacent precast panels, and replace the lifting fulcrums with formal supports;

[0008] Wherein, the target steel truss is a steel truss located above the auxiliary pier.

[0009] In combination with the first aspect, in one embodiment, the step of maintaining the top longitudinal beam above the target steel truss beam in a disconnected state, providing a temporary support below the separation point of the top longitudinal beam, and laying prefabricated panels above all steel trusses specifically includes:

[0010] Based on the load and span of the cable-stayed bridge, determine the location of the auxiliary piers and cast them;

[0011] The steel truss is erected, and based on the position of the auxiliary pier, the steel truss located above the auxiliary pier is calibrated as the target steel truss;

[0012] Splice the steel trusses, and keep the top longitudinal beam above the target steel trusses in a disconnected state, and the spliced ​​steel trusses form the cantilever of the cable-stayed bridge;

[0013] A temporary support is provided below the separation of the top longitudinal beam so that the gap between the end face of the top longitudinal beam of the target steel truss beam and the end face of the top longitudinal beam of the adjacent steel truss beam of the target steel truss beam is within the preset gap;

[0014] Use the plate laying equipment to lay precast panels on top of all steel trusses in sequence;

[0015] There are two groups of cantilevers of the cable-stayed bridge, and the two groups of cantilevers of the cable-stayed bridge are arranged opposite to each other along the transverse direction of the bridge.

[0016] In one embodiment, the provision of a temporary support below the separation point of the top longitudinal beam specifically includes:

[0017] The steel pipe piles with a length less than the height of the steel truss are placed below the separation of the top longitudinal beam, and the positions of the steel pipe piles in the two groups of cable-stayed bridge cantilevers are opposite;

[0018] Connect the bottom of the steel pipe pile to the bottom longitudinal beam of the target steel truss beam, and connect the rod of the steel pipe pile to the diagonal bracing beam of the target steel truss beam;

[0019] Based on the height difference between the target steel truss and the steel pipe piles, the thickness of the cushion beam located on the top of the steel pipe piles is determined, and the cushion beam is used to transversely connect the steel pipe piles at corresponding positions in the cantilevers of the two groups of cable-stayed bridges.

[0020] In one embodiment, the process of sequentially laying prefabricated panels on all steel trusses by means of a panel laying device specifically includes:

[0021] The slab laying equipment moves to one end of the cantilever of the cable-stayed bridge to lay the first precast slab on the steel truss;

[0022] The panel laying equipment uses the first precast panel that has been laid as a stepping stone to lay the next precast panel adjacent to the first precast panel until all the steel trusses are laid.

[0023] In one embodiment, the lifting of the target steel truss and the prefabricated panels above the steel trusses adjacent to the target steel truss, raising the lifting fulcrum located at the top of the auxiliary pier to support the target steel truss, connecting the top longitudinal beam above the target steel truss, and removing the temporary support specifically includes:

[0024] The hoisting equipment hoists the target steel truss and the precast panels above the steel trusses adjacent to the target steel truss, and places the hoisted precast panels in an adjacent internode, wherein the adjacent internode is one of the precast panels adjacent to the hoisted precast panels;

[0025] Raise the lifting support point located on the top of the auxiliary pier until the top of the lifting support point abuts against the bottom of the target steel truss;

[0026] Use connectors to connect the disconnected top longitudinal beam above the target steel truss and remove the temporary support.

[0027] In one embodiment, the lifting fulcrum includes a lifting cylinder and a support surface located at the telescopic end of the lifting cylinder and facing the bottom of the target steel truss.

[0028] In one embodiment, placing the lifted prefabricated panels in place, wet-joining all adjacent prefabricated panels, and replacing the lifting fulcrum with a formal support specifically includes:

[0029] The target steel truss and the precast panels hoisted above the steel trusses adjacent to the target steel truss are placed in place by hoisting equipment, and then wet-joining operations are performed between all adjacent precast panels;

[0030] Based on the wet joint hardness, the lifting fulcrum is lowered and removed, and a formal support is set at the original lifting fulcrum.

[0031] In a second aspect, an embodiment of the present application provides a cable-stayed bridge structure, which is obtained by laying based on the above-mentioned cable-stayed bridge cantilever prefabricated slab laying method, and the cable-stayed bridge structure includes:

[0032] A pier bottom assembly, wherein the pier bottom assembly comprises a plurality of auxiliary piers arranged at intervals, and the tops of the auxiliary piers are each provided with a support installation area for installing different supports according to the progress of the project;

[0033] A bridge deck assembly is located above the pier bottom assembly, and the bridge deck assembly includes two sets of oppositely arranged cable-stayed bridge cantilevers, and the cable-stayed bridge cantilevers include multiple steel trusses connected end to end, and a temporary support installation area is provided on the steel truss located above the auxiliary pier.

[0034] In combination with the second aspect, in one embodiment, the support installation area includes a lower groove arranged along the axial direction of the auxiliary pier, and a support support frame is provided on the inner wall of the lower groove.

[0035] In one embodiment, the pier bottom assembly further comprises a cable tower, on which a plurality of inclined cables diverging along the direction of the bridge and used to be respectively connected to a steel truss are disposed.

[0036] The beneficial effects brought by the technical solution provided by the embodiments of the present application include:

[0037] By setting up temporary supports below the separation point of the top and longitudinal beams above the target steel truss, the stability of the cable-stayed bridge cantilever is ensured during the laying of precast slabs, effectively preventing safety accidents caused by structural instability. By switching the support points between temporary supports and lifting fulcrums, the steel truss always maintains the correct posture, avoiding displacement of the steel truss and precast slabs. While ensuring that the cable-stayed bridge cantilever is always within the allowable deviation range of the design posture, the complexity of bridge deck laying is simplified, construction risks are reduced, and construction efficiency is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0039] Figure 1 A flow chart of a method for laying cantilever prefabricated slabs of a cable-stayed bridge provided in this application;

[0040] Figure 2 A schematic diagram of the target steel truss position in a method for laying a cantilever precast slab of a cable-stayed bridge provided in this application;

[0041] Figure 3 A schematic diagram of temporary support positions in a method for laying precast slabs of a cantilever of a cable-stayed bridge provided in this application;

[0042] Figure 4 A side view of a temporary support structure in a method for laying a cantilever prefabricated slab of a cable-stayed bridge provided in the present application;

[0043] Figure 5 A schematic diagram of a cable-stayed bridge structure provided for this application.

[0044] In the figure: 1. Target steel truss; 2. Temporary support; 201. Steel pipe pile; 202. Cushion beam; 3. Auxiliary pier; 4. Lifting fulcrum; 5. Cable tower; 501. Cable-stayed cable. DETAILED DESCRIPTION

[0045] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0046] The embodiments of the present application provide a method for laying precast slabs of a cable-stayed bridge cantilever and a cable-stayed bridge structure, which can solve the technical problem existing in the prior art that in order to reduce the out-of-plane bending moment of the crossbeam, some steel truss longitudinal beams are disconnected in the cantilever of the cable-stayed bridge, resulting in a reduction in the local stiffness of the bridge, posing a safety hazard to the subsequent laying of the bridge deck.

[0047] In a first aspect, the present application provides a method for laying a cantilever prefabricated slab of a cable-stayed bridge. Figure 1 A flow chart of a method for laying cantilever prefabricated slabs of a cable-stayed bridge provided in this application, such as Figure 1 As shown, the laying method of the cantilever prefabricated slab of the cable-stayed bridge specifically includes:

[0048] S1: Keep the top longitudinal beam above the target steel truss beam 1 in a disconnected state, set a temporary support 2 below the separation of the top longitudinal beam, and lay precast panels above all steel trusses;

[0049] Multiple steel trusses are laid in sequence along the bridge and connected end to end to form a cantilever of a cable-stayed bridge. Figure 2 A schematic diagram of the position of the target steel truss 1 in the method for laying the cantilever prefabricated slab of a cable-stayed bridge provided in this application, as shown in FIG. Figure 2 As shown, among multiple steel trusses, the steel truss located above the auxiliary pier 3 is marked as the target steel truss 1. During the splicing process, the top longitudinal beam of the target steel truss 1 and the top longitudinal beam of the steel truss adjacent to the target steel truss 1 remain separated to reduce the out-of-plane bending moment. There are two adjacent steel trusses to the target steel truss 1, which are respectively located on both sides of the target steel truss 1. Therefore, there are two groups of temporary supports 2 on the same target steel truss 1, which are respectively located on both sides of the target steel truss 1. The top of the installed temporary support 2 is against the bottom of the target steel truss 1 and the top longitudinal beam separation of the steel truss adjacent to the target steel truss 1. Subsequently, the precast slab is laid. Due to the support of the temporary support 2, the precast slab located above the target steel truss 1 has sufficient bearing capacity and can stably support the slab laying equipment to lay the precast slabs for the entire bridge deck.

[0050] S2: lifting the target steel truss 1 and the precast panels above the steel trusses adjacent to the target steel truss 1, raising the lifting support 4 located at the top of the auxiliary pier 3 to support the target steel truss 1, connecting the top longitudinal beam above the target steel truss 1, and removing the temporary support 2;

[0051] After all the prefabricated panels have been laid, the deck part of the cable-stayed bridge is formed. At this time, it is necessary to transfer the support source of the target steel truss 1 from the temporary support 2 to the auxiliary pier 3 under the premise of maintaining the current posture of the target steel truss 1. During the support source conversion process, in order to reduce the vertical load of the target steel truss 1 and reduce the risk of structural stress, the prefabricated panels above the target steel truss 1 and the adjacent steel trusses of the target steel truss 1 are first lifted, and then the lifting fulcrum 4 located on the top of the auxiliary pier 3 is raised to maintain the current splicing posture of the target steel truss 1 and the adjacent steel trusses of the target steel truss 1, and connect the top longitudinal beam of the target steel truss 1 with the top longitudinal beam of the adjacent steel truss of the target steel truss 1. Finally, the temporary support 2 is removed. At this time, the target steel truss 1 is supported by the auxiliary pier 3, and the support source conversion process is completed.

[0052] S3: Place the lifted precast panels to their original positions, make wet connections between all adjacent precast panels, and replace lifting support point 4 with a formal support.

[0053] The target steel truss 1 and the adjacent steel trusses of the target steel truss 1 have been connected, and the bottom of the target steel truss 1 is supported by the auxiliary pier 3. The structure of the cable-stayed bridge has been formed, the lifted precast panels are moved to the original position, and the wet connection work of the whole bridge is carried out. The laying of the cantilever precast panels of the cable-stayed bridge is completed.

[0054] Furthermore, step S1 specifically includes:

[0055] S101: Based on the load and span of the cable-stayed bridge, determine the position of the auxiliary pier 3 and cast it;

[0056] First, it is necessary to determine the position of the auxiliary pier 3 on the axis of the cable-stayed bridge. The selected position of the auxiliary pier 3 is generally determined based on factors such as the span of the cable-stayed bridge, the bridge deck load and the foundation. In a possible implementation of the present application, the auxiliary pier 3 is arranged in an area close to the end of the cable-stayed bridge. For a large-span cable-stayed bridge, especially in its end area, due to the cantilever effect, the end of the cable-stayed bridge may be subjected to a large bending moment and shear force. Arranging the auxiliary pier 3 in this area can effectively disperse these forces and enhance the overall stability of the cable-stayed bridge. At the same time, arranging the auxiliary pier 3 at the end of the cable-stayed bridge will also bring certain conveniences in construction, making it easier to carry out foundation construction and reducing material usage and construction costs.

[0057] S102: erecting steel trusses, and based on the position of the auxiliary pier 3, calibrating the steel trusses located above the auxiliary pier 3 as target steel trusses 1;

[0058] Based on the design drawings of the cable-stayed bridge, the steel trusses are erected in sequence so that the erected steel trusses are all within the allowable deviation range of the design attitude of the design drawings, and then the steel truss located above the auxiliary pier 3 is calibrated as the target steel truss 1.

[0059] S103: splicing the steel trusses, and keeping the top longitudinal beam above the target steel truss 1 in a disconnected state, and the spliced ​​steel trusses form a cantilever of the cable-stayed bridge;

[0060] Commonly used steel trusses generally include parallel top longitudinal beams, bottom longitudinal beams and diagonal bracing beams located between the top longitudinal beams and the bottom longitudinal beams. The two ends of the top longitudinal beam of the target steel truss beam 1 are respectively separated from the top longitudinal beams of the adjacent steel trusses of the target steel truss beam 1 located on both sides thereof, and the remaining steel trusses are all spliced ​​to form a cable-stayed bridge cantilever. The cable-stayed bridge cantilever is divided into two groups, and the two groups of cable-stayed bridge cantilevers are relatively arranged along the transverse direction of the bridge.

[0061] S104: a temporary support 2 is provided below the separation point of the top longitudinal beam, so that the gap between the end surface of the top longitudinal beam of the target steel truss beam 1 and the end surface of the top longitudinal beam of the adjacent steel truss beam of the target steel truss beam 1 is located within a preset gap;

[0062] Figure 3 A schematic diagram of the position of temporary support 2 in a method for laying precast slabs of a cantilever of a cable-stayed bridge provided in this application, as shown in FIG. Figure 3 As shown, the top of the temporary support 2 is located below the separation point between the target steel truss 1 and the top of the adjacent steel truss of the target steel truss 1. In step S102, all steel trusses have been laid according to the design drawings, and the posture of the target steel truss 1 is correct. Therefore, the temporary support 2 can maintain the current splicing posture of the target steel truss 1 and the adjacent steel trusses of the target steel truss 1, and support them to prevent the target steel truss 1 from being stressed and displaced during the prefabricated panel preset process.

[0063] S105: Laying precast panels on all steel trusses in sequence through the panel laying equipment;

[0064] The provision of temporary support 2 provides the target steel truss 1 with sufficient load-bearing capacity, which is sufficient to carry the paving equipment to facilitate the laying of precast slabs on the entire bridge deck.

[0065] Furthermore, in step S104, the steps for setting up the temporary support 2 specifically include:

[0066] S1041: placing a steel pipe pile 201 whose length is less than the height of the steel truss beam below the separation of the top longitudinal beam, and the steel pipe piles 201 in the two groups of cantilevers of the cable-stayed bridge are located opposite to each other;

[0067] S1042: Connect the bottom of the steel pipe pile 201 to the bottom longitudinal beam of the target steel truss beam 1, and connect the rod body of the steel pipe pile 201 to the diagonal bracing beam of the target steel truss beam 1;

[0068] S1043: Based on the height difference between the target steel truss 1 and the steel pipe pile 201, the thickness of the cushion beam 202 located on the top of the steel pipe pile 201 is determined, and the cushion beam 202 is used to transversely connect the steel pipe piles 201 at corresponding positions in the two groups of cable-stayed bridge cantilevers.

[0069] Figure 4 A side view of a temporary support structure in a method for laying a cantilever prefabricated slab of a cable-stayed bridge provided in this application, as shown in FIG. Figure 4 As shown, the length of the steel pipe pile 201 is less than the height of the steel truss. When the steel pipe pile 201 is connected to the target steel truss 1, the top of the steel pipe pile 201 is spaced a certain distance from the bottom surface of the top longitudinal beam of the target steel truss 1. The thickness of the cushion beam 202 is equal to the spacing distance, so that the cushion beam 202 is embedded between the top of the steel pipe pile 201 and the bottom surface of the top longitudinal beam of the target steel truss 1. The cushion beam 202 has a certain length, and its length is not less than the spacing distance between the two groups of cable-stayed bridge cantilevers, so that the two ends of the cushion beam 202 are simultaneously connected to the tops of the steel pipe piles 201 at corresponding positions in the two groups of cable-stayed bridge cantilevers.

[0070] Further, in step S105, prefabricated panels are laid on all steel trusses in sequence by using a panel laying device, specifically including:

[0071] S1051: The slab laying equipment moves to one end of the cantilever of the cable-stayed bridge to lay the first precast slab on the steel truss;

[0072] S1052: The planking equipment uses the first precast slab that has been laid as a stepping stone to lay the next precast slab adjacent to the first precast slab until all the steel trusses are laid.

[0073] The laying of precast slabs starts from one end of the cantilever of the cable-stayed bridge. The laying equipment uses the first precast slab that has been laid as a stepping stone to lay the second adjacent precast slab. Then, the third precast slab is laid using the second precast slab that has been laid, and the cycle continues until all steel trusses are laid.

[0074] Furthermore, step S2 specifically includes:

[0075] S201: The hoisting equipment hoists the target steel truss 1 and the precast panels above the steel trusses adjacent to the target steel truss 1, and places the hoisted precast panels in adjacent internodes, where the adjacent internode is one of the precast panels adjacent to the hoisted precast panels;

[0076] S202: raising the lifting support point 4 located at the top of the auxiliary pier 3 until the top of the lifting support point 4 abuts against the bottom of the target steel truss 1;

[0077] S203: Use a connector to connect the disconnected top longitudinal beam above the target steel truss 1, and remove the temporary support 2.

[0078] One precast panel is one bay, and the length of the precast panel along the bridge direction is greater than the length of the steel truss along the bridge direction. Therefore, one precast panel will cover the target steel truss 1 and the top of the adjacent steel truss of the target steel truss 1 at the same time. After lifting the precast panel, it will be temporarily placed on the adjacent bay, and then the lifting support 4 located on the top of the auxiliary pier 3 will be raised to maintain the current splicing posture of the target steel truss 1 and the adjacent steel truss of the target steel truss 1, so as to facilitate the connection between the top longitudinal beam of the target steel truss 1 and the top longitudinal beam of the adjacent steel truss of the target steel truss 1. When the connection work between the top longitudinal beam of the target steel truss 1 and the top longitudinal beam of the adjacent steel truss of the target steel truss 1 is completed, it means that the cantilever of the cable-stayed bridge has been completely spliced, the support source of the target steel truss 1 has also been transferred, and the construction personnel remove the temporary support 2.

[0079] The lifting fulcrum 4 includes a lifting cylinder and a supporting surface located at the telescopic end of the lifting cylinder and facing the bottom of the target steel truss 1 .

[0080] Furthermore, S3 specifically includes:

[0081] S301: placing the target steel truss 1 and the precast panels hoisted above the steel trusses adjacent to the target steel truss 1 to their original positions by means of hoisting equipment, and then performing wet connection operations between all adjacent precast panels;

[0082] S302: Based on the wet joint hardness, the lifting support point 4 is lowered and removed, and a formal support is set at the original lifting support point 4.

[0083] After the lifted precast panels are placed in place, wet joints are performed on the joints between adjacent precast panels. During this period, the lifting support 4 continues to remain in the lifted state. When the hardness of the joints meets the requirements, the lifting support 4 is lowered and replaced with a formal support. At this point, the laying of the cantilever precast panels of the cable-stayed bridge is completed.

[0084] In a second aspect, the embodiment of the present application further provides a cable-stayed bridge structure, which is obtained by laying the cantilever prefabricated slab based on the above-mentioned cable-stayed bridge cantilever prefabricated slab laying method. Figure 5 A schematic diagram of a cable-stayed bridge structure provided for this application is shown in FIG. Figure 5 As shown, the cable-stayed bridge structure includes a pier bottom assembly and a bridge deck assembly located above the pier bottom assembly, wherein the pier bottom assembly includes a plurality of auxiliary piers 3 arranged at intervals, and the tops of the auxiliary piers 3 are each provided with a support installation area for replacing different supports according to the progress of the project, and the bridge deck assembly includes two sets of relatively arranged cable-stayed bridge cantilevers, and the cable-stayed bridge cantilevers include a plurality of steel trusses connected end to end, and a temporary support installation area is provided on the steel trusses located above the auxiliary piers 3.

[0085] In a possible implementation, the support installation area is a lower groove arranged along the auxiliary pier 3, and a support support frame is provided in the groove, so that different types of supports can be embedded in the lower groove and fixed via the support support frame at different construction stages.

[0086] The steel truss generally includes a top longitudinal beam, a bottom longitudinal beam and a diagonal bracing beam arranged in parallel, and the temporary support installation area is located on the bottom longitudinal beam and the diagonal bracing beam of the steel truss, and the temporary support installation areas of the steel trusses in the two groups of cable-stayed bridge cantilevers are opposite, and the external temporary support 2 is connected to the steel truss via the temporary support installation area.

[0087] Furthermore, the pier bottom assembly also includes a cable tower 5, on which are provided a plurality of cable stays 501 which diverge along the direction of the bridge and are used to be respectively connected to a steel truss. The cable tower 5 extends out of the top of the cantilever of the cable-stayed bridge. The plurality of cable stays 501 are relatively arranged on both sides of the cable tower 5 along the direction of the bridge, and the plurality of cable stays 501 on the same side are arranged along the length direction of the cable tower 5, and the free ends of the plurality of cable stays 501 are respectively connected to a steel truss.

[0088] In the description of the present application, it should be noted that the terms "upper", "lower", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. Unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be a connection between the two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to the specific circumstances.

[0089] It should be noted that, in this application, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the presence of other identical elements in the process, method, article or device including the elements.

[0090] The above is only a specific implementation of the present application, so that those skilled in the art can understand or implement the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest range consistent with the principles and novel features applied for herein.

Claims

1. A method for laying cantilever prefabricated slabs of a cable-stayed bridge, characterized in that: include: Keep the top longitudinal beam above the target steel truss beam (1) in a disconnected state, set a temporary support (2) below the separation point of the top longitudinal beam, and lay prefabricated panels above all steel trusses; Lifting the target steel truss (1) and the precast panels above the steel trusses adjacent to the target steel truss (1), raising the lifting support (4) located on the top of the auxiliary pier (3) to support the target steel truss (1), connecting the top longitudinal beam above the target steel truss (1), and removing the temporary support (2); Place the lifted precast panels to their original positions, wet-join all adjacent precast panels, and replace the lifting support point (4) with a formal support; Wherein, the target steel truss (1) is a steel truss located above the auxiliary pier (3).

2. A method for laying cantilever prefabricated slabs of a cable-stayed bridge as claimed in claim 1, characterized in that: The method of maintaining the top longitudinal beam above the target steel truss beam (1) in a disconnected state, providing a temporary support (2) below the separation point of the top longitudinal beam, and laying prefabricated panels above all the steel trusses specifically includes: Based on the load and span of the cable-stayed bridge, the position of the auxiliary pier (3) is determined and poured; erecting a steel truss beam, and based on the position of the auxiliary pier (3), calibrating the steel truss beam located above the auxiliary pier (3) as a target steel truss beam (1); Splicing the steel trusses, keeping the top longitudinal beam above the target steel truss (1) in a disconnected state, and the spliced ​​steel trusses forming a cantilever of the cable-stayed bridge; A temporary support (2) is provided below the separation point of the top longitudinal beam, so that the gap between the end face of the top longitudinal beam of the target steel truss beam (1) and the end face of the top longitudinal beam of the adjacent steel truss beam of the target steel truss beam (1) is located within a preset gap; Use the plate laying equipment to lay precast panels on top of all steel trusses in sequence; There are two groups of cantilevers of the cable-stayed bridge, and the two groups of cantilevers of the cable-stayed bridge are arranged opposite to each other along the transverse direction of the bridge.

3. A method for laying cantilever prefabricated slabs of a cable-stayed bridge as claimed in claim 2, characterized in that: The temporary support (2) is provided below the separation point of the top longitudinal beam, and specifically comprises: Placing steel pipe piles (201) whose length is less than the height of the steel truss beam below the separation point of the top longitudinal beam, and the steel pipe piles (201) in the two groups of cantilevers of the cable-stayed bridge are located opposite to each other; The bottom of the steel pipe pile (201) is connected to the bottom longitudinal beam of the target steel truss (1), and the rod body of the steel pipe pile (201) is connected to the diagonal bracing beam of the target steel truss (1); Based on the height difference between the target steel truss (1) and the steel pipe pile (201), the thickness of the cushion beam (202) located on the top of the steel pipe pile (201) is determined, and the steel pipe piles (201) at corresponding positions in the cantilever of two groups of cable-stayed bridges are transversely connected through the cushion beam (202).

4. A method for laying cantilever prefabricated slabs of a cable-stayed bridge as claimed in claim 2, characterized in that: The process of sequentially laying prefabricated panels on all steel trusses by means of the panel laying equipment specifically includes: The slab laying equipment moves to one end of the cantilever of the cable-stayed bridge to lay the first precast slab on the steel truss; The panel laying equipment uses the first precast panel that has been laid as a stepping stone to lay the next precast panel adjacent to the first precast panel until all the steel trusses are laid.

5. The method for laying cantilever precast slabs of a cable-stayed bridge according to claim 1, characterized in that: The lifting of the target steel truss (1) and the prefabricated plate above the steel truss adjacent to the target steel truss (1), the lifting support (4) located at the top of the auxiliary pier (3) to support the target steel truss (1), the connection of the top longitudinal beam above the target steel truss (1), and the removal of the temporary support (2) specifically include: The hoisting equipment lifts the target steel truss (1) and the precast panels above the steel truss adjacent to the target steel truss (1), and places the lifted precast panels in an adjacent section, wherein the adjacent section is one of the precast panels adjacent to the lifted precast panel; Raise the lifting support point (4) located on the top of the auxiliary pier (3) until the top of the lifting support point (4) abuts against the bottom of the target steel truss (1); The disconnected top longitudinal beam above the target steel truss (1) is connected by a connecting piece, and the temporary support (2) is removed.

6. A method for laying cantilever prefabricated slabs of a cable-stayed bridge as claimed in claim 5, characterized in that: The lifting fulcrum (4) comprises a lifting cylinder and a supporting surface located at the telescopic end of the lifting cylinder and facing the bottom of the target steel truss (1).

7. A method for laying cantilever precast slabs of a cable-stayed bridge as claimed in claim 1, characterized in that: The method of placing the lifted prefabricated panels to their original positions, wet-joining all adjacent prefabricated panels, and replacing the lifting support point (4) with a formal support specifically includes: Using a lifting device, the target steel truss (1) and the precast panels lifted above the steel trusses adjacent to the target steel truss (1) are placed in their original positions, and then wet-joining operations are performed between all adjacent precast panels; Based on the wet joint hardness, the lifting support point (4) is lowered and removed, and a formal support is set at the original lifting support point (4).

8. A cable-stayed bridge structure, obtained by laying the cable-stayed bridge cantilever precast slab according to any one of claims 1 to 7, characterized in that: The cable-stayed bridge structure comprises: A pier bottom assembly, the pier bottom assembly comprising a plurality of auxiliary piers (3) arranged at intervals, and the tops of the auxiliary piers (3) are each provided with a support installation area for installing different supports according to the progress of the project; A bridge deck assembly is located above the pier bottom assembly, the bridge deck assembly comprises two sets of oppositely arranged cable-stayed bridge cantilevers, the cable-stayed bridge cantilevers comprise a plurality of steel trusses connected end to end, and a temporary support installation area is provided on the steel trusses located above the auxiliary pier (3).

9. A cable-stayed bridge structure as claimed in claim 8, characterized in that: The support installation area comprises a lower groove arranged along the axial direction of the auxiliary pier (3), and a support supporting frame is provided on the inner wall of the lower groove.

10. A cable-stayed bridge structure according to claim 9, characterized in that: The pier bottom assembly also includes a cable tower (5), on which a plurality of inclined cables (501) diverging along the direction of the bridge and used to be respectively connected to a steel truss are arranged.

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