Construction method for swinging end beams in blind zone of pier top

Abstract

A construction method for swinging end beams of a suspension bridge in a blind zone of a pier comprises: constructing a corbel (2, Figure 4) on a side wall of a cable tower 1 and installing a temporar

Description

TECHNICAL FIELD

[0001] The present disclosure relates to the technical field of suspension bridge construction, and in particular to a construction method for swinging end beams in a blind zone of a pier top. BACKGROUND

[0002] A suspension bridge refers to a bridge in which main cables suspended from and anchored on both banks by means of cable towers serve as the main load-bearing components of the superstructure. The geometric shape of the main cables is determined by force equilibrium conditions and typically approximates a parabola. Numerous hangers descend from the main cables to support the deck, and stiffening girders are generally installed between the deck and the hangers, forming a composite system with the main cables to reduce deflection induced by loads.

[0003] The deck of a suspension bridge is generally supported by cross braces of the cable towers, meaning that a steel framework of the deck directly rests on the cross braces of the cable towers. However, during construction in mountainous areas, especially for suspension bridges located between two tunnels, factors such as the tunnel road elevation and the overall dimensional proportions of the cable tower must be considered. This often results in a mismatch between the heights of the cross braces and the deck, causing interference between the steel framework beneath the deck and the cross braces of the cable towers. Conventional incremental launching methods cannot adapt to such situations. SUMMARY

[0004] The present disclosure aims to provide a construction method for swinging end beams in a blind zone of a pier top, in order to address the issue where interference between the steel framework beneath the deck and the cross braces of the cable tower renders conventional incremental launching methods inapplicable.

[0005] A construction method for swinging end beams in a blind zone of a pier top is provided, adopting the following technical solutions:

[0006] The present disclosure provides a construction method for swinging end beams in a blind zone of a pier top, including the following steps:

[0007] SI, constructing a corbel on a side wall of a cable tower, and installing a temporary suspension cable on the cable tower;

[0008] S2, hoisting a connection steel bridge by means of a cable crane, and connecting the connection steel bridge to a main cable by means of a hanger;

[0009] S3, hoisting an end beam steel bridge by means of the cable crane and the temporary suspension cable, such that a bottom of the end beam steel bridge abuts against the corbel, and positioning the end beam steel bridge in an avoidance position;

[0010] S4, disconnecting the cable crane from the end beam steel bridge, and temporarily restraining the end beam steel bridge by means of the temporary suspension cable and the corbel;

[0011] S5, hoisting a closure steel bridge by means of the cable crane, connecting the closure steel bridge to the connection steel bridge, and connecting the closure steel bridge to the main cable by means of the hanger;

[0012] S6, connecting the cable crane to the end beam steel bridge, and moving the end beam steel bridge to a connection position by means of the cable crane and the temporary suspension cable; and

[0013] S7, connecting the end beam steel bridge to the closure steel bridge, and connecting the end beam steel bridge to the corbel by means of a connection support, thereby completing construction of the end beam steel bridge.

[0014] By adopting the above technical solutions, during construction, the corbel is configured to support the end beam steel bridge while the temporary suspension cable is configured to hoist the end beam steel bridge, enabling the end beam steel bridge to be stably positioned at the avoidance position. Subsequently, the closure steel bridge is connected to the connection steel bridge. After the closure steel bridge is reliably installed, the cable crane and the temporary suspension cable work in coordination to move the end beam steel bridge to the connection position and connect it to the closure steel bridge. The construction of the end beam steel bridge is achieved merely by adding a temporary suspension cable, which is simple, convenient, and low-cost. In contrast, the traditional incremental launching method requires the installation of components such as temporary supports and sliding tracks. However, due to the presence of the corbel and cross braces, the space is narrow, making installation difficult. Forced installation may be costly and pose significant safety hazards.

[0015] Optionally, in the step S6, the cable crane is arranged above the closure steel bridge; and the end beam steel bridge is moved toward the closure steel bridge by winding a hoisting rope of the cable crane while releasing a hoisting rope of the temporary suspension cable until the end beam steel bridge reaches the connection position.

[0016] By adopting the above technical solutions, the short-distance sliding of the end beam steel bridge is achieved through the cable crane and the temporary suspension cable, thereby completing the movement of the end beam steel bridge at minimal cost under spatially constrained conditions.

[0017] Optionally, the end beam steel bridge includes a top plate, a side plate, and a bottom plate that are connected sequentially, the side plate is configured to connect to the closure steel bridge, the bottom plate is configured to contact a top surface of the corbel, and the top plate and the bottom plate are arranged on opposite sides of a cross brace of the cable tower in a vertical direction.

[0018] By adopting the above technical solutions, the top plate and the bottom plate are arranged on opposite sides of the cross brace, while the bottom plate contacts the top surface of the corbel. This allows the pressure on the top plate to be transferred through the bottom plate to the corbel, meaning that the corbel serves as a main load-bearing component. Compared to using the cross brace as the main load-bearing component to support the top plate, this approach is less likely to cause deformation of the top plate, and the overall strength, stability, and safety of the end beam steel bridge are improved.

[0019] Optionally, the connection support includes an upper support and a lower support, the upper support is connected to the end beam steel bridge, the lower support is connected to the corbel, and the upper support is connected to the lower support.

[0020] By adopting the above technical solutions, the upper support and the lower support cooperate to provide bearing support for the end beam steel bridge.

[0021] Optionally, a bottom surface of the upper support is provided with a ball, a top surface of the lower support is provided with a groove, and the ball is adapted to the groove.

[0022] By adopting the above technical solutions, the ball and the groove cooperate to facilitate the alignment between the upper support and the lower support.

[0023] Optionally, when the end beam steel bridge is in the avoidance position, the upper support is connected to the end beam steel bridge, and the ball contacts the top surface of the corbel; and when the end beam steel bridge is in the connection position, the lower support is located below the upper support, and the ball is located within the groove.

[0024] By adopting the above technical solutions, when the end beam steel bridge moves, the ball can contact the top surface of the corbel when necessary, helping to reduce friction between the end beam steel bridge and the corbel, thereby facilitating the sliding of the end beam steel bridge. Meanwhile, when the upper support and the lower support are joined together, the ball and the groove facilitate alignment, improving the installation accuracy of the upper support and the lower support.

[0025] Optionally, in the step S6, when the end beam steel bridge moves toward the closure steel bridge, the end beam steel bridge is hoisted to a height greater than a height of the closure steel bridge; the lower support is installed on the corbel; the end beam steel bridge is lowered such that the ball descends into the corresponding groove, while the end beam steel bridge is aligned with the closure steel bridge to position the end beam steel bridge in the connection position; and the temporary suspension cable is disconnected from the end beam steel bridge.

[0026] By adopting the above technical solutions, the cooperation of the upper support, the lower support, the ball, and the groove facilitates effective support for the end beam steel bridge, allowing for the subsequent release of the temporary suspension cable.

[0027] Optionally, the upper support is internally provided with a first connection chamber, and the lower support is internally provided with a second connection chamber; and after the ball descends into the groove, the first connection chamber is in communication with the second connection chamber.

[0028] By adopting the above technical solutions, the first connection chamber and the second connection chamber facilitate grouting after alignment, enabling a reliable connection between the upper support and the lower support, thereby ensuring effective support for the end beam steel bridge.

[0029] Optionally, after the ball descends into the groove, grouting is conducted on the first connection chamber and the second connection chamber; and a lateral wind-resistant support is installed on the corbel and connected to the upper support and the lower support.

[0030] Optionally, the upper support is connected to the end beam steel bridge by means of bolts.

[0031] In conclusion, the present disclosure has at least the following beneficial technical effects:

[0032] 1. During construction, the corbel is configured to support the end beam steel bridge while the temporary suspension cable is configured to hoist the end beam steel bridge, enabling the end beam steel bridge to be stabilized at the avoidance position. Subsequently, the closure steel bridge is connected to the connection steel bridge. After the closure steel bridge is reliably installed, the cable crane and the temporary suspension cable work in coordination to move the end beam steel bridge to the connection position and connect it to the closure steel bridge. The construction of the end beam steel bridge is achieved merely by adding a temporary suspension cable, which is simple, convenient, and low-cost. This overcomes the issues of the traditional incremental launching method, where the presence of the corbel and cross braces results in narrow spaces, making installation difficult. Forced installation leads to high costs and significant safety hazards.

[0033] 2. The short-distance sliding of the end beam steel bridge is achieved through the cable crane and the temporary suspension cable, thereby completing the movement of the end beam steel bridge at minimal cost under spatially constrained conditions.

[0034] 3. When the end beam steel bridge moves, the ball can contact the top surface of the corbel when necessary, helping to reduce friction between the end beam steel bridge and the corbel, thereby facilitating the sliding of the end beam steel bridge. Meanwhile, when the upper support and the lower support are joined together, the ball and the groove facilitate alignment, improving the installation accuracy of the upper support and the lower support. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] FIG. 1 shows a schematic flowchart illustrating the construction method for swinging end beams in a blind zone of a pier top according to the present disclosure;

[0036] FIG. 2 shows a schematic side view showing the cable tower and the main cable according to the present disclosure;

[0037] FIG. 3 shows a schematic perspective view showing the cable tower and the main cable according to the present disclosure; and

[0038] FIG. 4 shows a schematic side cross-sectional view showing the upper support and the lower support according to the present disclosure.

[0039] Reference numerals are: 1: cable tower; 11: cross brace; 2: corbel; 3: main cable; 31: cable crane; 32: hanger; 4: temporary suspension cable; 5: connection steel bridge; 6: closure steel bridge; 7: end beam steel bridge; 71: top plate; 72: side plate; 73: bottom plate; 8: upper support; 81: ball; 82: first connection chamber; 9: lower support; 91: groove; 92: second connection chamber. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0040] The present disclosure will be described in further detail below in combination with the accompanying drawings. These drawings are all simplified schematic diagrams, which merely illustrate the basic structure of the present disclosure in a schematic manner, and thus only show the parts associated with the present disclosure.

[0041] In the description of the present disclosure, the terms "central", "longitudinal", "transverse", "long", "wide", "thick", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "anticlockwise", "axial", "radial", and "circumferential", etc. are used to indicate orientations or position relations shown in the accompanying drawings. It should be noted that these terms are used herein for ease and simplification of description of the present disclosure rather than indicating or implying that the stated device or element must have a specific orientation or must be constructed and operated in a specific orientation, and thus cannot be construed as limitations to the present disclosure. In addition, features defined with "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present disclosure, unless otherwise specified, "a plurality of means two or more. In the description of the present disclosure, it should be noted that, unless otherwise clearly specified, meanings of terms "mount", "connected with", and "connected to" should be understood in abroad sense. For example, the connection may be a fixed connection, a removable connection, or an integral connection; may be a mechanical connection or an electrical connection; may be a direct connection or an indirect connection by using an intermediate medium; or may be intercommunication between two elements. Those of ordinary skill in the art may understand specific meanings of the foregoing terms in the present disclosure based on a specific situation.

[0042] Example 1

[0043] A construction method for swinging end beams in a blind zone of a pier top, with reference to FIG. 1 to FIG. 4, includes the following steps:

[0044] SI. Corbels 2 are constructed on side walls of cable tower 1, and a temporary suspension cable 4 is simultaneously installed on the cable tower 1.

[0045] S2. The corbels 2 are constructed on the two inner side walls of the cable tower 1, with the corbels 2 positioned lower than the cross braces 11 of the cable tower 1, while the temporary suspension cable 4 is installed on the cable tower 1, with the temporary suspension cable 4 positioned higher than the cross braces 11 of the cable tower 1.

[0046] S3. A connection steel bridge 5 is hoisted by the cable crane 31, where the connection steel bridge 5 includes multiple segments. Typically, a segment of the connection steel bridge 5 at the lowest position of the main cable 3 is hoisted first, which is generally also a midpoint between two adjacent cable towers 1. Multiple segments of the connection steel bridge 5 are connected sequentially, and the connection is achieved by means of high-strength bolts and welding. The connection steel bridge 5 and the main cable 3 are connected by means of hangers 32 to enhance the stability of the connection steel bridge 5.

[0047] S4. An end beam steel bridge 7 is hoisted by means of the cable crane 31 and the temporary suspension cable 4, such that a bottom of the end beam steel bridge 7 abuts against the corbels 2, and the end beam steel bridge 7 is positioned at an avoidance position. During hoisting, the end beam steel bridge 7 is lifted by means of the cable crane 31 to a height above the corbels 2. At this point, the temporary suspension cable 4 is connected to the end beam steel bridge 7. The temporary suspension cable 4 is installed on one end of the cable tower 1 away from the connection steel bridge 5, such that the temporary suspension cable 4 can pull the end beam steel bridge 7 in a direction away from the connection steel bridge 5, positioning the end beam steel bridge 7 at the avoidance position. When the end beam steel bridge 7 is in the avoidance position, it provides space for the hoisting and construction of the closure steel bridge 6, facilitating the construction of the closure steel bridge 6.

[0048] The end beam steel bridge 7 includes a top plate 71, a side plate 72, and a bottom plate 73 that are connected sequentially. The side plate 72 is configured to connect to the closure steel bridge 6, and the bottom plate 73 is configured to contact the top surface of the corbel 2. The top plate 71 and the bottom plate 73 are located on opposite sides of the cross brace 11 of the cable tower 1 in a vertical direction. The top plate 71 and the bottom plate 73 are arranged on opposite sides of the cross brace 11 in the vertical direction, while the bottom plate 73 contacts the top surface of the corbel 2. This arrangement allows the pressure on the top plate 71 to be transferred through the bottom plate 73 to the corbel 2, meaning that the corbel 2 serves as a main load-bearing component. Compared to using the cross brace 11 as the main load-bearing component to support the top plate 71, this approach is less likely to cause deformation of the top plate 71, and the overall strength, stability, and safety of the end beam steel bridge 7 are improved.

[0049] A connection support is provided between the end beam steel bridge 7 and the corbel 2. The connection support includes an upper support 8 and a lower support 9. The upper support 8 is connected to the bottom plate 73 of the end beam steel bridge 7, the lower support 9 is connected to the corbel 2, and the upper support 8 is connected to the lower support 9. The cooperation of the upper support 8 and the lower support 9 facilitates support for the end beam steel bridge 7. A ball 81 is rotatably connected to a bottom surface of the upper support 8, and a groove 91 is provided on a top surface of the lower support 9. The ball 81 is adapted to the groove 91. The cooperation of the ball 81 and the groove 91 facilitates alignment between the upper support 8 and the lower support 9.

[0050] Before hoisting the end beam steel bridge 7, the upper support 8 is connected to the bottom plate 73 of the end beam steel bridge 7 by means of high-strength bolts. When the end beam steel bridge 7 is in the avoidance position, the ball 81 contacts the top surface of the corbel 2.

[0051] S5. The connection between the cable crane 31 and the end beam steel bridge 7 is disconnected. The end beam steel bridge 7 is temporarily restrained by means of the temporary suspension cable 4 and the corbels 2, thereby maintaining the end beam steel bridge 7 at the avoidance position.

[0052] S6. The closure steel bridge 6 is hoisted by means of the cable crane 31, and the closure steel bridge 6 is connected to the connection steel bridge 5. Subsequently, the closure steel bridge 6 is connected to the main cable 3 by means of the hangers 32.

[0053] S7. The cable crane 31 and the closure steel bridge 6 are then disconnected, and the cable crane 31 is instead connected to the end beam steel bridge 7. By coordinating the cable crane 31 and the temporary suspension cable 4, the end beam steel bridge 7 is moved to a connection position. After the cable crane 31 is disconnected from the closure steel bridge 6, the cable crane 31 is positioned above the closure steel bridge 6. At this point, a hoisting rope of the cable crane 31 is wound in, while hoisting ropes of the temporary suspension cable 4 are simultaneously released, causing the end beam steel bridge 7 to move toward the closure steel bridge 6 until the end beam steel bridge 7 reaches the connection position. The short-distance sliding of the end beam steel bridge 7 is achieved through the cable crane 31 and the temporary suspension cable 4, accomplishing the movement of the end beam steel bridge 7 at minimal cost under spatially constrained conditions.

[0054] Specifically, when the end beam steel bridge 7 is moving toward the closure steel bridge 6, the end beam steel bridge 7 is hoisted to a height greater than that of the closure steel bridge 6. At this time, the lower supports 9 are installed on the corbels 2. Subsequently, the end beam steel bridge 7 is lowered, causing the balls 81 to descend into the corresponding grooves 91, while the end beam steel bridge 7 is aligned with the closure steel bridge 6 to position the end beam steel bridge 7 at the connection position. At this time, the temporary suspension cable 4 and the end beam steel bridge 7 are then disconnected.

[0055] When the end beam steel bridge 7 is in the avoidance position, the upper supports 8 are connected to the end beam steel bridge 7, and the balls 81 are in contact with the top surfaces of the corbels 2. When the end beam steel bridge 7 is in the connection position, the lower supports 9 are located below the upper supports 8, and the balls 81 are positioned within the grooves 91.

[0056] It should be noted that, in theory, the balls 81 should not contact the top surfaces of the corbels 2 during the movement of the end beam steel bridge 7. However, in actual construction, the balls 81 may contact the top surfaces of the corbels 2 during the swinging due to control inaccuracies in the hoisting ropes. In such cases, this contact helps reduce friction between the end beam steel bridge 7 and the corbels 2, thereby facilitating the sliding of the end beam steel bridge 7. When the upper supports 8 and the lower supports 9 are being joined together, the balls 81 and the grooves 91 facilitate alignment, improving the installation accuracy of the upper supports 8 and the lower supports 9.

[0057] S8. After the temporary suspension cable 4 is disconnected from the end beam steel bridge 7, the end beam steel bridge 7 is connected to the closure steel bridge 6, and the end beam steel bridge 7 is connected to the corbels 2 by means of the connection support, thereby completing the construction of the end beam steel bridge 7. The upper supports 8 are provided with first connection chambers 82, and the lower supports 9 are provided with second connection chambers 92. After the balls 81 descend into the grooves 91, the first connection chambers 82 are in communication with the second connection chambers 92. After the balls 81 descend into the grooves 91, grouting is conducted on the first connection chambers 82 and the second connection chambers 92. Subsequently, lateral wind-resistant supports are installed on the corbels 2 and connected to the upper supports 8 and the lower supports 9. The grouting conducted into the first connection chambers 82 and the second connection chambers 92 after alignment creates a reliable connection between the upper supports 8 and the lower supports 9, thereby ensuring effective support for the end beam steel bridge 7.

[0058] Working Principle: During construction, the corbel 2 is configured to support the end beam steel bridge 7, while the temporary suspension cable 4 is configured to hoist the end beam steel bridge 7, enabling the end beam steel bridge 7 to be stabilized at the avoidance position. Subsequently, the closure steel bridge 6 is connected to the connection steel bridge 5. After the closure steel bridge 6 is reliably installed, the cable crane 31 and the temporary suspension cable 4 work in coordination to move the end beam steel bridge 7 to the connection position and connect it to the closure steel bridge 6. The construction of the end beam steel bridge 7 is achieved merely by adding the temporary suspension cable 4, which is simple, convenient, and low-cost.

[0059] In the traditional incremental launching method, the connection steel bridge 5 and the closure steel bridge 6 are typically hoisted first. After the connection steel bridge 5 and the closure steel bridge 6 are connected, the end beam steel bridge 7 is hoisted onto the cross braces 11. Temporary supports and sliding tracks are then installed on the side walls of the cable tower, followed by the installation of incremental launching equipment. The end beam steel bridge 7 is pushed out by the coordinated action of the incremental launching equipment and the sliding tracks until the end beam steel bridge 7 aligns with and is connected to the closure steel bridge 6. However, due to interference between the heights of the cross braces 11 and the end beam steel bridge 7, the design uses the corbels 2 to support the end beam steel bridge 7. The presence of the corbels 2 and the cross braces 11 results in narrow spaces, making it difficult to install the temporary supports and sliding tracks. Forced installation may lead to high costs and significant safety risks. In contrast, only the cable crane 31 and the temporary suspension cable 4 work together to achieve the movement of the end beam steel bridge 7 through a "swinging" method in the present disclosure, thereby facilitating the erection of the end beam steel bridge 7. The swinging method involves winding the cable crane 31 while releasing the temporary suspension cable 4, or releasing the cable crane 31 while winding the temporary suspension cable 4, causing the end beam steel bridge 7 to move while swinging in the air, hence the term "construction method for swinging end beams".

[0060] The example of this specific implementation is a preferred example of the present disclosure and is not intended to limit the protective scope of the present disclosure. The same components are represented by the same reference numerals. Therefore, all equivalent changes made in accordance with the structure, shape, and principle of this application shall fall within the protective scope of the present disclosure.

Claims

1. A construction method for swinging end beams in a blind zone of a pier top, comprising the following steps:SI, constructing a corbel (2) on a side wall of a cable tower (1), and installing a temporary suspension cable (4) on the cable tower (1);S2, hoisting a connection steel bridge (5) by means of a cable crane (31), and connecting the connection steel bridge (5) to a main cable (3) by means of a hanger (32);S3, hoisting an end beam steel bridge (7) by means of the cable crane (31) and the temporary suspension cable (4), whereby a bottom of the end beam steel bridge (7) abuts against the corbel (2), and positioning the end beam steel bridge (7) in an avoidance position;S4, disconnecting the cable crane (31) from the end beam steel bridge (7), and temporarily restraining the end beam steel bridge (7) by means of the temporary suspension cable (4) and the corbel (2);S5, hoisting a closure steel bridge (6) by means of the cable crane (31), connecting the closure steel bridge (6) to the connection steel bridge (5), and connecting the closure steel bridge (6) to the main cable (3) by means of the hanger (32);S6, connecting the cable crane (31) to the end beam steel bridge (7), and moving the end beam steel bridge (7) to a connection position by means of the cable crane (31) and the temporary suspension cable (4); andS7, connecting the end beam steel bridge (7) to the closure steel bridge (6), and connecting the end beam steel bridge (7) to the corbel (2) by means of a connection support, thereby completing construction of the end beam steel bridge (7).

2. The construction method for swinging end beams in a blind zone of a pier top according to claim 1, wherein in the step S6, the cable crane (31) is arranged above the closure steel bridge (6); and the end beam steel bridge (7) is moved toward the closure steel bridge (6) by winding a hoisting rope of the cable crane (31) while releasing a hoisting rope of the temporary suspension cable (4) until the end beam steel bridge (7) reaches the connection position.

3. The construction method for swinging end beams in a blind zone of a pier top according to claim 2, wherein the end beam steel bridge (7) comprises a top plate (71), a side plate (72), and a bottom plate (73) that are connected sequentially, the side plate (72) is configured to connect to the closure steel bridge (6), the bottom plate (73) is configured to contact a top surface of the corbel (2), and the top plate (71) and the bottom plate (73) are arranged on opposite sides of a cross brace(11) of the cable tower (1) in a vertical direction.

4. The construction method for swinging end beams in a blind zone of a pier top according to claim 2, wherein the connection support comprises an upper support (8) and a lower support (9), the upper support (8) is connected to the end beam steel bridge (7), the lower support (9) is connected to the corbel (2), and the upper support (8) is connected to the lower support (9).

5. The construction method for swinging end beams in a blind zone of a pier top according to claim 4, wherein a bottom surface of the upper support (8) is provided with a ball (81), a top surface of the lower support (9) is provided with a groove (91), and the ball (81) is adapted to the groove (91).

6. The construction method for swinging end beams in a blind zone of a pier top according to claim 5, wherein in a case that the end beam steel bridge (7) is in the avoidance position, the upper support (8) is connected to the end beam steel bridge (7), and the ball (81) contacts the top surface of the corbel (2); andin a case that the end beam steel bridge (7) is in the connection position, the lower support (9) is located below the upper support (8), and the ball (81) is located within the groove (91).

7. The construction method for swinging end beams in a blind zone of a pier top according to claim 6, wherein in the step S6, when the end beam steel bridge (7) moves toward the closure steel bridge (6), the end beam steel bridge (7) is hoisted to a height greater than a height of the closure steel bridge (6); the lower support (9) is installed on the corbel (2); the end beam steel bridge (7) is lowered such that the ball (81) descends into the groove (91), while the end beam steel bridge (7) is aligned with the closure steel bridge (6) to position the end beam steel bridge (7) in the connection position; and the temporary suspension cable (4) is disconnected from the end beam steel bridge (7).

8. The construction method for swinging end beams in a blind zone of a pier top according to claim 7, wherein the upper support (8) is internally provided with a first connection chamber (82), and the lower support (9) is internally provided with a second connection chamber (92); and after the ball (81) descends into the groove (91), the first connection chamber (82) is in communication with the second connection chamber (92).

9. The construction method for swinging end beams in a blind zone of a pier top according toclaim 8, wherein after the ball (81) descends into the groove (91), grouting is conducted on the first connection chamber (82) and the second connection chamber (92); and a lateral wind-resistant support is installed on the corbel (2) and is connected to the upper support (8) and the lower support (9).

10. The construction method for swinging end beams in a blind zone of a pier top according to claim 9, wherein the upper support (8) is connected to the end beam steel bridge (7) by means of bolts.A

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