Anchorage system for main cable anchorage of suspension bridge

Abstract

The anchoring system of the rear anchor surface of the main cable of the suspension bridge can effectively prevent oil leakage at the anchor surface after the main cable of the suspension bridge is anchored, and facilitate the maintenance and repair of the main cable anchoring anchoring system. It includes a sealing cover and an oil leakage prevention gasket. The sealing cover is fixedly installed on the rear end face of the anchor pad by fastening bolts arranged at circumferential intervals. The working anchor plate is placed in the sealing cover, and the oil leakage prevention gasket is arranged between the rear end face of the anchor pad and the sealing cover port. It is characterized in that: the oil leakage prevention gasket includes a main gasket and an auxiliary gasket with different elastic moduli arranged concentrically, and corresponding main gasket annular grooves and auxiliary gasket annular grooves are arranged on the rear end face of the anchor pad. The port part of the sealing cover presses the contact surface of the main gasket and the auxiliary gasket under the action of the fastening bolts to form a labyrinth seal; a reserved grease injection structure leading to the outside of the sealing cover is arranged in the sealing cover, and polyurethane filler is injected into the cavity in the sealing cover through the reserved grease injection structure; the sealing cover is a variable thickness structure.

Description

Technical Field

[0001] The invention relates to a bridge, in particular to an anchor surface anchoring system after the main cable of a suspension bridge is anchored. Background Art

[0002] The oil-filled non-bonded prestressed steel strand anchorage system for the main cable of the suspension bridge consists of the front anchor surface anchorage system, the anchor body intermediate system (steel strands, embedded steel pipes, special anti-corrosion grease, etc.), and the rear anchor surface anchorage system.

[0003] The traditional rear anchor surface anchoring system consists of a sealing cover and an oil-leakage-proof gasket. The sealing cover is fixed to the rear end face of the anchor plate by fastening bolts arranged at intervals in the circumference, and the working anchor plate is encapsulated in the sealing cover. The oil-leakage-proof gasket is arranged between the rear end face of the anchor plate and the sealing cover port. The disadvantage is that the anti-leakage ability is weak, which causes troubles for later maintenance and repair. In addition, the sealing cover usually adopts an equal-thickness cylindrical structure with poor pressure-bearing capacity. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide an anchoring system for the rear anchor surface of the main cable of a suspension bridge, so as to effectively prevent oil leakage at the rear anchor surface of the main cable of the suspension bridge and facilitate the maintenance and repair of the main cable anchoring system.

[0005] The technical solution adopted by the present invention to solve the technical problem is as follows:

[0006] The anchor surface anchoring system of the main cable of the suspension bridge of the present invention comprises a sealing cover and an anti-leakage gasket, wherein the sealing cover is fixedly mounted on the rear end face of the anchor pad plate by fastening bolts arranged at intervals in the circumferential direction, the working anchor plate is placed in the sealing cover, and the anti-leakage gasket is arranged between the rear end face of the anchor pad plate and the sealing cover port, and is characterized in that: the anti-leakage gasket comprises a main gasket and an auxiliary gasket which are arranged concentrically and have different elastic moduli, and corresponding main gasket annular grooves and auxiliary gasket annular grooves are arranged on the rear end face of the anchor pad plate, and the port portion of the sealing cover presses the contact surface of the main gasket and the auxiliary gasket under the action of the fastening bolts to form a labyrinth seal; a reserved grease injection structure leading to the outside of the sealing cover is arranged in the sealing cover, and a polyurethane filler is injected into the cavity in the sealing cover through the reserved grease injection structure; the sealing cover is a variable thickness structure;

[0007] The sealing cover comprises a spherical shell portion and an annular base, a thickened transition section is formed between the spherical shell portion and the annular base, and an annular flange corresponding to the annular groove of the main gasket is formed on the bottom surface of the annular base;

[0008] The reserved grease injection structure includes a first grease injection channel and a second grease injection channel. The first grease injection channel runs through the front and rear plate surfaces of the working anchor plate, and the second grease injection channel is arranged in the anchor pad. The rear port of the second grease injection channel is connected to the inner port of the first grease injection channel, and the front port of the second grease injection channel is located outside the sealing cover and is closed by a sealing bolt installed thereon.

[0009] The beneficial effects of the present invention are that a main gasket and an auxiliary gasket are arranged between the rear end face of the anchor plate and the port of the sealing cover to form a labyrinth seal, and a reserved grease injection structure is provided for injecting polyurethane filler into the cavity inside the sealing cover, thereby providing reliable protection against oil leakage of the anchor surface anchoring system after the suspension bridge is anchored; the sealing cover is a variable thickness structure, which effectively improves its pressure bearing capacity; the structure is reasonable, the sealing performance is reliable, and the maintenance and repair of the main cable anchoring system are convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] This specification includes the following six drawings:

[0011] Figure 1 It is a structural schematic diagram of the anchor surface anchoring system of the existing main cable anchoring of the suspension bridge;

[0012] Figure 2 It is a structural schematic diagram of the anchor surface anchoring system of the main cable of the suspension bridge of the present invention;

[0013] Figure 3 is along Figure 2 Sectional view along line AA;

[0014] Figure 4 is along Figure 2 A magnified view of the part in middle B;

[0015] Figure 5 It is an enlarged view of the local structure of the working anchor plate in the anchor surface anchoring system after the main cable of the suspension bridge is anchored in the present invention;

[0016] Figure 6 The present invention is a cross-sectional view of a sealing cover in the anchor surface anchoring system after the main cable of the suspension bridge is anchored.

[0017] The figure shows the components and corresponding marks: anchor plate 1, working anchor plate 2, sealing cover 3, spherical shell part 3a, annular base 3b, thickened transition section 3c, annular flange 3d, polyurethane filler 4, main gasket 5, main gasket annular groove 5a, auxiliary gasket 6, auxiliary gasket annular groove 6b, fastening bolt 7, bolt washer 8, sealing bolt 10, sealing gasket 11, first grease injection channel 12a, second grease injection channel 12b, anchor system reinforcement steel bar 13, embedded pipe 14, prestressed steel bundle 15, special anti-corrosion grease 16. DETAILED DESCRIPTION

[0018] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0019] Figure 1It is a structural diagram of the anchoring system of the rear anchor surface of the main cable of the existing suspension bridge. The traditional rear anchor surface anchoring system consists of a sealing cover 3 and an oil leakage prevention gasket. The sealing cover 3 is fixedly installed on the rear end face of the anchor pad 1 by the fastening bolts 7 arranged at intervals in the circumference, and the working anchor plate 2 is encapsulated in the sealing cover 3. The oil leakage prevention gasket is arranged between the rear end face of the anchor pad 1 and the port of the sealing cover 3. The disadvantage is that the anti-leakage ability of grease is weak, which causes troubles for later maintenance and repair. In addition, the sealing cover 3 usually adopts an equal-thickness cylindrical structure, which has poor pressure bearing capacity.

[0020] Reference Figure 2 , Figure 3 , Figure 4 and Figure 5 The anchor surface anchoring system of the main cable of the suspension bridge of the present invention comprises a sealing cover 3 and an oil leakage prevention gasket. The sealing cover 3 is fixedly installed on the rear end face of the anchor pad 1 by the fastening bolts 7 arranged at intervals in the circumference. The working anchor plate 2 is placed in the sealing cover 3, and the oil leakage prevention gasket is arranged between the rear end face of the anchor pad 1 and the port of the sealing cover 3. The oil leakage prevention gasket comprises a main gasket 5 and an auxiliary gasket 6 which are arranged concentrically and have different elastic moduli, and corresponding main gasket annular grooves 5a and auxiliary gasket annular grooves 6b are arranged on the rear end face of the anchor pad 1. The port part of the sealing cover 3 presses the contact surface of the main gasket 5 and the auxiliary gasket 6 under the action of the fastening bolts 7 to form a labyrinth seal; a reserved grease injection structure leading to the outside of the sealing cover 3 is arranged in the sealing cover 3, and the polyurethane filler 4 is injected into the cavity in the sealing cover 3 through the reserved filling structure.

[0021] The present invention provides reliable protection for the oil leakage prevention of the rear anchor surface anchoring system of the suspension bridge anchoring by arranging a main gasket 5 and an auxiliary gasket 6 to form a labyrinth seal between the rear end face of the anchor pad 1 and the port of the sealing cover 3, and arranging a reserved grease injection structure for injecting a polyurethane filler 4 into the cavity of the sealing cover 3. The sealing cover 3 adopts a variable thickness structure to effectively improve its pressure bearing capacity. The rear anchor surface anchoring system has a reasonable structure and reliable sealing performance, which is convenient for the maintenance and repair of the main cable anchoring anchoring system.

[0022] Reference Figure 6 The sealing cover 3 has a spherical shell portion 3a and an annular base 3b, a thickened transition section 3c is provided between the spherical shell portion 3a and the annular base 3b, and an annular flange 3d corresponding to the annular groove 5a of the main gasket is provided on the bottom surface of the annular base 3b. The main gasket 5 is pressed by the bottom surface 3d of the annular flange to make it fully elastically deformed to ensure the sealing effect.

[0023] Reference Figure 4The reserved grease injection structure includes a first grease injection channel 12a and a second grease injection channel 12b. The first grease injection channel 12a runs through the front and rear plate surfaces of the working anchor plate 2, and the second grease injection channel 12b is arranged in the anchor pad 1. The rear port of the second grease injection channel 12b is connected to the inner port of the first grease injection channel 12a, and the front port of the second grease injection channel 12b is located outside the sealing cover 3 and is closed by the sealing bolt 10 installed thereon.

[0024] The above description is only to illustrate some principles of the anchor surface anchoring system of the main cable of the suspension bridge of the present invention, and is not intended to limit the present invention to the specific structure and applicable scope shown and described. Therefore, all corresponding modifications and equivalents that may be used belong to the patent scope applied for by the present invention.

Claims

1. A rear anchor surface anchoring system for anchoring a main cable of a suspension bridge, comprising a sealing cover (3) and an oil leakage prevention gasket, wherein the sealing cover (3) is fixedly mounted on the rear end surface of an anchor pad (1) by fastening bolts (7) arranged at intervals in the circumferential direction, a working anchor plate (2) is placed in the sealing cover (3), and the oil leakage prevention gasket is arranged between the rear end surface of the anchor pad (1) and a port of the sealing cover (3), wherein the sealing cover (3) is characterized in that: The anti-leakage gasket comprises a main gasket (5) and an auxiliary gasket (6) which are concentrically arranged and have different elastic moduli, and a corresponding main gasket annular groove (5a) and an auxiliary gasket annular groove (6b) are arranged on the rear end surface of the anchor plate (1); the port portion of the sealing cover (3) presses the contact surface of the main gasket (5) and the auxiliary gasket (6) when the fastening bolt (7) is pressed against the contact surface of the main gasket (5) and the auxiliary gasket (6) to form a labyrinth seal; a reserved grease injection structure leading to the outside of the sealing cover (3) is arranged in the sealing cover (3), and a polyurethane filler (4) is injected into the cavity of the sealing cover (3) through the reserved filling structure; the sealing cover (3) is a variable thickness structure; the sealing cover (3) has a spherical shell portion (3a) and an annular base (3b), and the spherical shell portion (3a) and the annular base (3b) are provided. A thickened transition section (3c) is provided between the main part (3a) and the annular base (3b); the bottom surface of the annular base (3b) is provided with an annular flange (3d) corresponding to the annular groove (5a) of the main gasket; the reserved grease injection structure comprises a first grease injection channel (12a) and a second grease injection channel (12b); the first grease injection channel (12a) passes through the front and rear plate surfaces of the working anchor plate (2); the second grease injection channel (12b) is arranged in the anchor plate (1); the rear port of the second grease injection channel (12b) is connected to the inner port of the first grease injection channel (12a); the front port of the second grease injection channel (12b) is located outside the sealing cover (3) and is closed by a sealing bolt (10) installed thereon.

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