Construction method of cable beam of ground anchor type space cable suspension bridge

Abstract

This application discloses a cable-beam construction method for a ground-anchored spatial cable suspension bridge, relating to the field of suspension bridge construction technology, including the following steps: S1: constructing anchorages, bridge towers, and foundations; S2: sequentially completing the erection of the catwalk, main cable erection, catwalk re-hanging, and cable clamp installation, then fixing the top of the suspenders to the cable clamps; S3: installing two sets of single-cable cable-carrying cranes, which can rotate relative to the main cable or travel along its length in an unloaded state, and can rotate relative to the main cable without slipping in a loaded state; S4: the two sets of single-cable cable-carrying cranes synchronously and symmetrically lift two main beam segments; S5: completing the hoisting of all main beam segments; S6: applying a secondary dead load, achieving the designed bridge alignment for the two main cables. The cable-beam construction method of this application adopts a cable-first, beam-later construction approach, eliminating the need for temporary lateral supports between the main cables, and automatically achieving the designed bridge alignment as the main cables are gradually hoisted along with the main beam segments.

Description

Technical Field

[0001] This application relates to the field of suspension bridge construction technology, specifically to a method for constructing the cable beams of a ground-anchored spatial cable suspension bridge. Background Technology

[0002] Currently, the construction methods for space cable suspension bridges can be divided into two categories:

[0003] The first construction method, "beam-first, cable-later" (i.e., assembling the main beam segments before tensioning the main cables), is mostly used for self-anchored suspension bridges and requires the erection of scaffolding within the suspended section of the main beam. The second construction method, "cable-first, beam-later" (i.e., tensioning the main cables before assembling the main beam segments), is mostly used for ground-anchored suspension bridges and is suitable for large-span construction. In the second method, the main cables are first erected, then supported or tensioned at multiple points in the air to adjust the lateral spacing between the cables to the theoretical bridge-ready state. Finally, using the main cables as supports, the main beam segments are hoisted segment by segment using floating cranes or cable cranes.

[0004] However, the first type of construction method is unsuitable for deep-water environments or waters with complex winds and waves because it requires the erection of scaffolding. The second type of construction method requires adding top supports or tie rods to the main cable at multiple locations at high altitudes, and all of these need to be dismantled later, resulting in complex procedures and a large amount of high-altitude work. Despite the above-mentioned problems in the construction of spatial cable suspension bridges, their application in engineering projects is gradually increasing due to their advantages in terms of landscape and wind resistance. Therefore, those skilled in the art urgently need to propose a simpler construction method suitable for spatial cable suspension bridges. Summary of the Invention

[0005] To address the shortcomings of existing technologies, the purpose of this application is to provide a cable-beam construction method for a ground-anchored spatial cable suspension bridge. This method employs a cable-first, beam-later construction approach, eliminating the need for temporary lateral supports between the main cables. Furthermore, the main cables are automatically hoisted into the designed bridge alignment as the main beam segments are gradually installed.

[0006] To achieve the above objectives, the technical solution adopted is: a method for constructing the cable girder of a ground-anchored spatial cable suspension bridge, comprising the following steps:

[0007] S1: Construction anchorages, bridge towers and foundations;

[0008] S2: Complete the catwalk erection, main cable erection, catwalk re-hanging, and cable clamp installation in sequence, and then fix the top of the sling to the cable clamp;

[0009] S3: Install two sets of single-cable cable-mounted cranes. The two sets of single-cable cable-mounted cranes are always symmetrically arranged along the vertical centerline of the bridge. Each set of single-cable cable-mounted cranes includes two single-cable cable-mounted cranes that are matched to the two main cables respectively. The single-cable cable-mounted cranes can rotate relative to the main cables or travel along their length when unloaded, and can rotate relative to the main cables but not slide when loaded.

[0010] S4: Two sets of single-cable cable-carrying cranes synchronously and symmetrically lift two main beam segments. The main beam segments are lifted to the designated positions, and the lower ends of the corresponding slings are connected to the main beam segments. During the lifting of the main beam segments, the two single-cable cable-carrying cranes in the same set rotate relative to the main cables, and the spacing between the two main cables gradually tends to the design of the bridge shape.

[0011] S5: Repeat S4, symmetrically lift the main beam segments, and after each lifting of a main beam segment, connect the newly lifted main beam segment with the adjacent installed main beam segment until the lifting work of all main beam segments is completed;

[0012] S6: Apply the second-stage dead load, and the alignment of the two main cables achieves the designed bridge alignment.

[0013] Based on the above technical solution, in step S3, the single-cable crane can rotate relative to the main cable without slipping under load, which includes:

[0014] The single-cable cable-borne crane is connected to the main cable in a non-clamping contact manner. The single-cable cable-borne crane rotates around the main cable, and the single-cable cable-borne crane restricts its sliding along the length of the main cable through its own temporary cable clamps and traction devices.

[0015] Based on the above technical solution, step S2 further includes: the two ends of the two main cables are connected to the anchorage through the cable saddle, the middle of the two main cables crosses the main cable saddle at the top of the bridge tower, the cable clamp is fixed to the main cable, and the catwalk is suspended on the main cable.

[0016] Based on the above technical solution, step S4 includes: synchronously and symmetrically lifting and installing the main beam segment from the two bridge towers to the mid-span, or synchronously and symmetrically lifting and installing the main beam segment from the mid-span to the two bridge towers.

[0017] Based on the above technical solution, when the lateral spatial effect of the main cable is small, the connection between the single cable-carrying crane and the main cable can adopt a clamping contact structure; when the single cable-carrying crane lifts the main beam segment, the main cable undergoes torsional deformation to adapt to the rotational displacement of the cable around the main cable during the lifting process of the main beam segment.

[0018] Based on the above technical solutions, when the distance between the main cable and the top surface of the main beam segment in the middle of the span is small and cannot meet the space requirements of the single cable-mounted crane, the corresponding main beam segment can be hoisted by a floating crane.

[0019] Based on the above technical solution, step S1 also includes temporarily anchoring the load-bearing cable of the catwalk to the anchorages on both sides; in step S4, when the cable spacing between the two main cables gradually tends to be designed as a bridge shape, the two catwalks also move synchronously.

[0020] Based on the above technical solution, the cable clamp is equipped with a rotational pre-offset during installation to compensate for the rotational displacement of the cable clamp relative to the main cable in steps S4 to S6.

[0021] Based on the above technical solution, the single-cable cable-carrying crane has at least four outriggers, each of which straddles the top of the main cable. The outriggers can be used to alternately cross cable clamps, as well as the catwalk and the main cable mounting positions.

[0022] The beneficial effects of the technical solution provided in this application include:

[0023] The cable-beam construction method for the ground-anchored spatial cable suspension bridge proposed in this application adopts a construction method of cable first and beam later, which eliminates the need for supports under the main beam and is suitable for deep water and complex wind and wave waters.

[0024] After the two main cables are erected, two sets of single-cable cable-mounted cranes are used to lift the two main beam segments synchronously and symmetrically each time. There is no need to set up temporary transverse supports between the two main cables. Compared with the existing technology that uses temporary transverse supports to adjust the transverse alignment of the main cables in advance before lifting the main beam segments, the cable beam construction method of this application can reduce the amount of high-altitude work, simplify the construction process, and reduce construction risks.

[0025] During the gradual and symmetrical lifting of the main girder segments, the single-cable cable-mounted crane can rotate relative to the main cable, causing changes in the spatial alignment of the two main cables, including the spacing between them. As the main girder segments are lifted, the alignment of the two main cables gradually approaches the designed bridge alignment. Before and after the weight of the main girder segment is transferred from the single-cable cable-mounted crane to the corresponding suspenders, the attitude of the main cables and suspenders remains relatively stable. Compared to existing technologies, the feature of the single-cable cable-mounted crane rotating relative to the main cable can effectively reduce or avoid the twisting of the main cable and the bending of the suspenders during construction.

[0026] At the same time, each main beam segment is lifted to the designated position, and the lower end of the corresponding sling is connected to the main beam segment. The sling has minimal lateral rotation when under load, and the sling installation is simple and efficient. Attached Figure Description

[0027] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0028] Figure 1 Elevation and plan layout of a spatial cable suspension bridge provided for the first embodiment of this application.

[0029] Figure 2 Elevation and plan layout of a spatial cable suspension bridge provided for the second embodiment of this application.

[0030] Figure 3 Elevation and plan layout of a spatial cable suspension bridge provided for the third embodiment of this application.

[0031] Figure 4 This is an elevation view of the hoisting of the main beam segment in the first, second, or third embodiment of this application.

[0032] Figure 5 This is a schematic diagram of the hoisting cross-section of the main beam segment in the first or second embodiment of this application.

[0033] Attached reference numerals: 1. Main cable; 2. Anchorage; 3. Bridge tower; 4. Single cable-mounted crane; 41. Lifting cable; 5. Main beam segment; 6. Catwalk; 7. Suspension cable. Detailed Implementation

[0034] To make the objectives, technical solutions, and advantages of this application clearer, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. Furthermore, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0035] like Figures 1 to 5 As shown, this application discloses a method for constructing the cable girder of a ground-anchored spatial cable suspension bridge, including the following steps:

[0036] S1: Construction anchorage, bridge tower and foundation.

[0037] S2: Complete the erection of catwalk 6, main cable 1, catwalk 6 re-hanging, and cable clamp installation in sequence, and then fix the top of sling 7 to the cable clamp.

[0038] S3: Install two sets of single-cable cable-mounted cranes 4, which are always symmetrically arranged along the vertical centerline of the bridge. Each set of single-cable cable-mounted cranes 4 includes two cranes 4 respectively matched to the two main cables 1. One set of single-cable cable-mounted cranes 4 is used to lift one main beam segment 5. The two sets of single-cable cable-mounted cranes 4 work simultaneously, that is, simultaneously lift two main beam segments 5, so that the force on the main cable 1 is symmetrical about the left and right sides along the vertical centerline of the bridge. The single-cable cable-mounted cranes 4 can rotate relative to the main cable 1 or travel along its length when unloaded, and can rotate relative to the main cable 1 without slipping when loaded.

[0039] S4: Two sets of single-cable cable-mounted cranes 4 synchronously and symmetrically lift two main beam segments 5. The main beam segments 5 are lifted to the designated position, and the lower ends of the corresponding slings 7 are connected to the main beam segments 5. The load on the main beam segments 5 then changes from being borne by the single-cable cable-mounted cranes 4 to being borne by the slings 7. During the lifting process of the main beam segments 5, both single-cable cable-mounted cranes 4 in the same set rotate relative to the main cables 1, and the spacing between the two main cables 1 gradually tends towards the designed bridge alignment.

[0040] S5: Repeat S4, symmetrically lifting the main beam segments 5, lifting two main beam segments 5 symmetrically each time, and connecting the newly lifted main beam segment 5 with the adjacent installed main beam segment 5 after each lifting, until the lifting of all main beam segments 5 is completed. Specifically, during the lifting of the main beam segments 5, adjacent main beam segments 5 can be permanently rigidly connected, either at an opportune time or after all beam segments have been lifted.

[0041] S6: Apply the second-stage dead load, and the alignment of the two main cables 1 achieves the designed bridge alignment. Specifically, the second-stage dead load is the weight of construction materials such as crash barriers and asphalt paving; after applying the second-stage dead load, the alignment of the two main cables 1 achieves the designed bridge alignment.

[0042] The cable girder construction method of the ground-anchored spatial cable suspension bridge of this application adopts the construction method of cable first and then girder, and no support is required under the main girder. It is suitable for deep water and complex wind and wave waters. After the two main cables 1 are erected, two sets of single-cable cable-carrying cranes 4 are used to lift two main girder segments 5 synchronously and symmetrically each time. There is no need to set up temporary transverse supports between the two main cables 1. Compared with the existing technology that uses temporary transverse supports to adjust the transverse alignment of the main cables in advance before lifting the main girder segments, the cable girder construction method of this application can reduce the amount of high-altitude work, simplify the construction process, and reduce construction risks.

[0043] During the gradual and symmetrical lifting of the main beam segment 5, the single-cable cable-mounted crane 4 can rotate relative to the main cable 1, causing changes in the spatial alignment of the two main cables 1, including the spacing between them. As the main beam segment 5 is lifted, the alignment of the two main cables 1 gradually approaches the designed bridge alignment. Before and after the weight of the main beam segment 5 is transferred from the single-cable cable-mounted crane 4 to the corresponding suspender cable 7, the postures of the main cable 1 and the suspender cable 7 remain relatively stable. The feature of the single-cable cable-mounted crane 4 rotating relative to the main cable 1, compared with existing technologies, can effectively reduce or avoid the twisting of the main cable 1 and the bending of the suspender cable 7 during construction. At the same time, when each main beam segment 5 is lifted to the designated position, the lower end of the corresponding suspender cable 7 is connected to the main beam segment 5. The suspender cable 7 has minimal lateral rotation under load, and its installation is simple and efficient.

[0044] In one embodiment, based on the above technical solution, step S3, in which the single-cable crane 4 can rotate relative to the main cable 1 without slipping under load, includes:

[0045] The single-cable cable-borne crane 4 is connected to the main cable 1 via a non-clamping contact connection, and the single-cable cable-borne crane 4 rotates around the main cable 1. The single-cable cable-borne crane 4 restricts its sliding along the length of the main cable 1 through its own temporary cable clamps and traction devices, while accommodating the rotational displacement of the lifting cable 41 of the single-cable cable-borne crane 4 around the main cable 1 during the lifting of the main beam segment 5.

[0046] Specifically, the single-cable cable-mounted crane 4 includes a specific temporary cable clamp, which allows it to rotate relative to the main cable 1 without slipping. Specifically, a traction device connects the temporary cable clamp and the main cable 1. The temporary cable clamp is connected to the main cable 1 in a non-clamping manner. The temporary cable clamp can rotate relative to the main cable 1, and the traction device pulls on the temporary cable clamp to prevent it from slipping along the length of the main cable. The temporary cable clamp is a unique structure of the single-cable cable-mounted crane 4, while the traction device and cable clamp are equivalent to those of a conventional cable-mounted crane.

[0047] The cable girder construction method of this application, through the temporary cable clamps, cable clamps and traction devices of the single cable-carrying crane 4, enables the single cable-carrying crane 4 to rotate relative to the main cable 1 under load without slipping, which provides a basis for the subsequent two main cables 1 to gradually tend towards the design bridge alignment.

[0048] In one embodiment, step S2 further includes:

[0049] The two ends of the two main cables 1 are connected to the anchor 2 through the cable saddles. The middle of the two main cables 1 crosses the main cable saddle at the top of the bridge tower 3, and the cable clamp is fixed to the main cable 1.

[0050] Step S2 also includes hanging the load-bearing cable of the catwalk 6 on the main cable 1, and the shape of the load-bearing cable of the catwalk 6 is consistent with that of the main cable 1.

[0051] In one embodiment, based on the above technical solution, step S4 includes:

[0052] The main beam segment 5 can be hoisted and installed synchronously and symmetrically from the two bridge towers to the mid-span, or it can be hoisted and installed synchronously and symmetrically from the mid-span to the two bridge towers.

[0053] In a particular embodiment, when the lateral spatial effect of the main cable 1 is small, specifically, when the lateral spatial effect is less than or equal to a set threshold, the connection between the single-cable cable-carrying crane 4 and the main cable 1 can adopt a clamping contact structure; when the single-cable cable-carrying crane 4 lifts the main beam segment 5, the main cable 1 undergoes torsional deformation to adapt to the rotational displacement of the cable around the main cable 1 during the lifting process of the main beam segment 5.

[0054] Specifically, the smaller lateral spatial effect of the main cable 1 indicates that the lateral angle of the suspender cable 7 is small in the completed bridge state, and the suspender cable 7 is closer to the plumb line, which means that the torsional deformation of the main cable 1 is smaller in the subsequent construction process; when the rotation amplitude is very small, the torsional deformation of the main cable 1 can be used directly to adapt to the angle change.

[0055] In another specific embodiment, when the distance between the main cable 1 in the middle of the span and the top surface of the main beam segment 5 is small, specifically, when the distance between the main cable 1 in the middle of the span and the top surface of the main beam segment 5 is less than a set distance, and the space requirements of the single cable-mounted crane 4 cannot be met, the corresponding main beam segment 5 can be assisted by floating crane hoisting.

[0056] In one embodiment, step S1 further includes temporarily anchoring the load-bearing cable of the catwalk 6 to the anchors on both sides; in step S4, as the cable spacing between the two main cables 1 gradually tends to be designed as a bridge shape, the two catwalks 6 also move synchronously.

[0057] During the actual hoisting of the main beam segment, as the main beam segment is slowly lifted, the force and direction of the cable sling 7 of the cable-driven crane continuously change, and the main cable 1 and the catwalk 6 are accompanied by spatial displacement.

[0058] In one embodiment, the cable clamp is provided with a rotational pre-offset during installation to compensate for the rotational displacement of the cable clamp relative to the main cable 1 in steps S4 to S6.

[0059] Specifically, at the very beginning, when the two main cables 1 are hanging down naturally, there is a certain gap between the two main cables 1, which facilitates the installation of the single-cable cable-borne crane 4.

[0060] In one embodiment, the single-cable cable-borne crane further comprises at least four outriggers, each outrigger straddling the top of the main cable 1, the outriggers being used to alternately cross cable clamps, as well as the catwalk 6 and the mounting position of the main cable 1.

[0061] Preferably, the four legs are evenly spaced along the length of the main cable.

[0062] Furthermore, in step S4, connecting the newly lifted main beam segment 5 with the adjacent already installed main beam segment 5 also includes:

[0063] Initially, the newly hoisted main beam segment 5 is hinged to the adjacent already installed main beam segment 5 on the top surface, and the lower edges between the beam segments are open, that is, the newly hoisted main beam segment 5 is in an upward-curving state; the main cable gradually moves down under the gravity of the newly hoisted main beam segment 5, so that the gap between the lower edges of the already hoisted beam segments gradually closes. The adjacent main beam segments 5 can be permanently rigidly connected when the opportunity arises or after all beam segments are hoisted.

[0064] Furthermore, this application provides various embodiments of spatial cable suspension bridges, including top views of the bridge's alignment. Figure 1 , Figure 2and Figure 3 ; Figure 1 The main cable 1 between the two bridge towers 3 is petal-shaped, and the main cables 1 on both sides of the two bridge towers 3 are in a straight line. Figure 2 The main cable 1 between the two bridge towers 3 is petal-shaped, and the main cables 1 on both sides of the two bridge towers 3 fork. Figure 3 The main cables 1 on both sides of the two bridge towers 3 are two parallel lines, and the main cables 1 between the two bridge towers 3 are arcs that are close to each other.

[0065] Figure 1 , Figure 2 and Figure 3 All three types of spatial cable suspension bridges can be constructed using the cable-beam construction method described in this application.

[0066] In the description of this application, it should be noted that the terms "upper," "lower," etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. Unless otherwise expressly specified and limited, the terms "installed," "connected," and "linked" 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; they can refer to the internal communication between two elements. For those skilled in the art, the specific meaning of the above terms in this application can be understood according to the specific circumstances.

[0067] It should be noted that in this application, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0068] The above description is merely a specific embodiment of this application, enabling those skilled in the art to understand or implement this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features claimed herein.

Claims

1. A method for constructing the cable girder of a ground-anchored spatial cable suspension bridge, characterized in that, Includes the following steps: S1: Construction anchorages, bridge towers and foundations; S2: Complete the installation of the catwalk (6), the main cable (1), the catwalk (6) re-hanging, and the cable clamp installation in sequence, and then fix the top of the sling (7) to the cable clamp; S3: Install two sets of single-cable cable-mounted cranes (4). The two sets of single-cable cable-mounted cranes (4) are always symmetrically arranged along the vertical centerline of the bridge. Each set of single-cable cable-mounted cranes (4) includes two single-cable cable-mounted cranes (4) respectively matched with two main cables (1). The single-cable cable-mounted cranes (4) can rotate relative to the main cable (1) or travel along its length when unloaded, and can rotate relative to the main cable (1) but not slide when loaded. S4: Two sets of single-cable cable-carrying cranes (4) synchronously and symmetrically lift two main beam segments (5), and the main beam segments (5) are lifted to the designated position. The lower end of the corresponding sling (7) is connected to the main beam segment (5). During the lifting process of the main beam segment (5), the two single-cable cable-carrying cranes (4) of the same set rotate relative to the main cable (1), and the cable spacing between the two main cables (1) gradually tends to be designed as a bridge shape. S5: Repeat S4, symmetrically lift the main beam segment (5), and after each lifting of the main beam segment (5), connect the newly lifted main beam segment (5) with the adjacent installed main beam segment (5) until the lifting work of all main beam segments (5) is completed; S6: Apply the second-stage dead load, and the alignment of the two main cables (1) reaches the design bridge alignment; In step S3, the single-cable crane (4) can rotate relative to the main cable (1) without slipping under load, including: The single cable-carrying crane (4) is connected to the main cable (1) in a non-clamping contact manner. The single cable-carrying crane (4) rotates around the main cable (1), and the single cable-carrying crane (4) restricts the single cable-carrying crane (4) from sliding along the length direction of the main cable (1) through its own temporary cable clamp and traction device.

2. The cable girder construction method for a ground-anchored spatial cable suspension bridge as described in claim 1, characterized in that, Step S2 also includes: The two ends of the two main cables (1) are connected to the anchor (2) through the cable saddle. The middle of the two main cables (1) crosses the main cable saddle at the top of the bridge tower (3). The cable clamp is fixed to the main cable (1). The catwalk (6) is hung on the main cable (1).

3. The cable girder construction method for a ground-anchored spatial cable suspension bridge as described in claim 1, characterized in that, Step S4 includes: The main beam segments are hoisted and installed synchronously and symmetrically from the two bridge towers to the mid-span (5), or from the mid-span to the two bridge towers synchronously and symmetrically (5).

4. The cable girder construction method for a ground-anchored spatial cable suspension bridge as described in claim 1, characterized in that: When the lateral space effect of the main cable (1) is small, the connection between the single cable hoist (4) and the main cable (1) adopts a clamping contact structure; when the single cable hoist (4) lifts the main beam segment (5), the main cable (1) undergoes torsional deformation to adapt to the rotational displacement of the cable around the main cable (1) during the lifting process of the main beam segment (5).

5. The cable girder construction method for a ground-anchored spatial cable suspension bridge as described in claim 1, characterized in that: When the distance between the main cable (1) in the middle of the span and the top surface of the main beam segment (5) is small and cannot meet the space requirements of the single cable-mounted crane (4), the corresponding main beam segment (5) is hoisted by a floating crane.

6. The cable girder construction method for a ground-anchored spatial cable suspension bridge as described in claim 1, characterized in that, In step S1, the load-bearing cable of the catwalk (6) is temporarily anchored to the anchors on both sides; in step S4, when the cable spacing between the two main cables (1) gradually tends to be designed as a bridge shape, the two catwalks (6) also move synchronously.

7. The cable girder construction method for a ground-anchored spatial cable suspension bridge as described in claim 1, characterized in that: The cable clamp is set with a rotational pre-offset during installation to compensate for the rotational displacement of the cable clamp relative to the main cable (1) in steps S4 to S6.

8. The cable girder construction method for a ground-anchored spatial cable suspension bridge as described in claim 1, characterized in that: The single-cable cable-borne crane has at least four outriggers, each straddling the top of the main cable (1), which are used to alternately cross the cable clamps, as well as the catwalk (6) and the mounting position of the main cable (1).

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