Anchoring structure of prestressed concrete cable-stayed bridge UHPC

Abstract

An anchoring structure of a prestressed concrete cable-stayed bridge UHPC is characterized by comprising a box girder web, a UHPC block, a prestressed steel beam, a PBL shear key, an anchor pulling plate, a stiffening plate, a cable anchor head, an anchor bearing plate, an anchor pipe and an anchor pulling plate upper end. The box girder web and the UHPC block are connected into a whole through prestressed steel bars, and the two parallel anchor pulling plates are connected with the UHPC block through PBL shear keys. The stiffening plates are welded to the two sides of the anchoring plate, and the stiffening plates and the anchoring plate are welded to the upper end of the anchoring plate. The anchor pipe penetrates through the upper end of the anchor pulling plate, the lower end of the stay cable is fixed through the stay cable anchor head, and the stay cable anchor head is connected with the anchor bearing plate at the lower end of the anchor pipe.

Description

Technical Field

[0001] This patent relates to an anchoring structure for a prestressed concrete UHPC cable-stayed bridge, specifically an anchoring structure for a cable-stayed cable and a concrete main beam. Background Art

[0002] As a cable-stayed system, the cable-stayed bridge has a greater span capacity than the beam-type bridge and is the most common type of long-span bridge. The cable-stayed bridge is an internal high-order statically indeterminate structure, and the constant load stress state of the main beam and the cable tower can be adjusted by tensioning the cables. In a properly designed cable-stayed bridge, under the action of constant load, the bending moment diagram and shear diagram of the main beam are closer to those of a multi-span continuous beam, and the cable tower basically only bears axial pressure. Therefore, how to anchor the cables has become an issue that needs to be strictly addressed during the construction of cable-stayed bridges. At present, the anchor block structure at the bottom of the beam is adopted, and the cable guide must pass through the web, which affects the effective cross-section of the web. The anchor block structure in the box is adopted, which affects the effective cross-section of the top plate. Therefore, the present application proposes an anchoring structure for prestressed concrete cable-stayed bridge UHPC that does not affect the effective cross-section of the web or the top plate. Utility Model Content

[0003] The cable is the main part of the force transmission between the bridge deck and the bridge tower on the cable-stayed bridge, and the cable anchoring system is the key part of the force transmission between the cable and the bridge deck and the bridge tower. The cable anchoring system will produce stress concentration under different service conditions. The technical problem to be solved by this utility model is to provide an anchoring structure for prestressed concrete UHPC cable-stayed bridge to solve the existing problems in the cable anchoring area.

[0004] In response to the above-mentioned problems, the technical problem to be solved by the present invention is an anchoring structure for a prestressed concrete (UHPC) cable-stayed bridge. It features a box girder and a section of cable-stayed cable anchored thereto. The structure is characterized by: post-cast UHPC concrete blocks installed on top of the webs at corresponding locations on the box girder sections; prestressed steel strands embedded within the webs and UHPC concrete blocks; and, after tensioning the post-cast concrete blocks, the prestressed steel strands connect to the webs to form a force-bearing integral body. The steel anchor box and two anchor plates, each with a through-hole, are connected to the UHPC concrete blocks via PBL shear keys extending through the through-holes.

[0005] Preferably, a UHPC block is provided on the top of the box girder web, and prestressed steel strands are embedded in the main beam web and the UHPC block. After the UHPC block is tensioned at one end, the UHPC block is connected to the main beam web to form a force-bearing whole, so that the anchor point of the inclined cable and the center of the web are in the same vertical plane, eliminating the transverse eccentric bending moment of the cable force on the web, and making the cable-beam anchor block transmit force clearly and bear force reasonably.

[0006] Preferably, the two anchor plates are connected to the UHPC blocks through perforations via PBL shear keys, utilizing the tensile properties of the UHPC blocks to facilitate the construction of the stay cable anchoring system.

[0007] Preferably, the two anchor plates are parallel to the anchor pipe, which facilitates installation and daily maintenance.

[0008] Preferably, the two anchor plates are perpendicular to the edge lines of the UHPC blocks. By adjusting the edge lines of the UHPC blocks, the angle of the anchor pipe is adjusted, thereby adjusting the angle of the inclined cable, which is conducive to adjusting the cable force during construction.

[0009] Compared with the prior art, the present invention has the following advantages:

[0010] 1. The anchoring structure of the UHPC prestressed concrete cable-stayed bridge of the utility model effectively utilizes the high performance of the UHPC block to resist the corrosion of the anchor block.

[0011] 2. The reinforcement device of the utility model utilizes the stress characteristics of the inclined cable anchoring system, anchored by the UHPC block and the main beam top plate, and the cable anchoring point and the web center are in the same straight line, which can effectively improve the internal force distribution of the main beam web and make the beam cable anchoring system transmit force clearly.

[0012] 3. The anchoring structure design of the UHPC of the utility model is scientific and reasonable, with strong practicality, which changes the traditional anchoring method and has the characteristics of convenient construction and easy maintenance.

[0013] The present invention will be described in further detail below with reference to the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a planar structural diagram of the utility model;

[0015] Figure 2 This is a structural elevation diagram of the present utility model.

[0016] Description of reference numerals:

[0017] 1—Box girder web; 2—UHPC block; 3—Prestressed steel bar;

[0018] 4—PBL shear key; 5—anchor plate; 6—stiffener plate;

[0019] 7—cable anchor head; 8—anchor pad; 9—anchor pipe;

[0020] 10—upper end of anchor plate; DETAILED DESCRIPTION

[0021] like Figure 1 and Figure 2As shown, it includes a box girder web 1, UHPC blocks 2, prestressed steel bars 3, PBL shear keys 4, anchor plates 5, stiffening plates 6, cable anchor heads 7, anchors 7, anchor pads 8, anchor pipes 9, and anchor plate upper ends 10. The box girder web 1 and UHPC blocks 2 are connected as a whole via prestressed steel bars, and the two parallel anchor plates 5 are connected to the UHPC blocks 2 via PBL shear keys 4. The stiffening plates 6 are welded to both sides of the anchor plates 5, and the stiffening plates 6 and anchor plates 5 are welded to the anchor plate upper ends 10. The anchor pipe 9 passes through the anchor plate upper ends 10, secures the lower ends of the inclined cables via the cable anchor heads 7, and connects the cable anchor heads 7 to the anchor pads 8 at the lower ends of the anchor pipes 9.

[0022] In this embodiment, a UHPC block 2 is provided on top of the box girder web 1, and prestressed steel strands 3 are embedded in the main girder web 1 and the UHPC block 2. After single-end tensioning, the UHPC block 2 is connected to the main girder web 1 to form a force-bearing whole. This ensures that the anchor point of the stay cable and the center of the web are in the same vertical plane, eliminating the transverse eccentric bending moment of the cable force on the web, and ensuring clear force transmission and reasonable force distribution between the cable-beam anchor blocks.

[0023] In this embodiment, the two anchor plates 5 are connected to the UHPC block 2 through the PBL shear keys 4 through perforations, utilizing the tensile properties of the UHPC block 2 to facilitate the construction of the stay cable anchoring system.

[0024] In this embodiment, the two anchor plates 5 are parallel to the anchor pipe 9, which is convenient for installation and daily maintenance.

[0025] In this embodiment, the two anchor plates 5 are perpendicular to the edge lines of the UHPC blocks 2. By adjusting the edge lines of the UHPC blocks 2, the angles of the anchor pipes 9 and thus the angles of the stay cables can be adjusted, which is beneficial for adjusting the cable force during construction.

[0026] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any way. Any simple modification, change and equivalent variation of the above embodiment made according to the technical essence of the present invention shall still fall within the scope of protection of the technical solution of the present invention.

Claims

1. An anchoring structure for a prestressed concrete cable-stayed bridge UHPC, characterized in that The invention comprises a box girder web (1), a UHPC block (2), a prestressed steel bundle (3), a PBL shear key (4), an anchor plate (5), a stiffening plate (6), a cable anchor head (7), an anchor pad (8), an anchor pipe (9) and an upper end of the anchor plate (10); the box girder web (1) and the UHPC block (2) are connected to form a whole through prestressed steel bars; the two parallel anchor plates (5) are connected to the UHPC block (2) through the PBL shear key (4); the stiffening plate (6) is welded to both sides of the anchor plate (5), and the stiffening plate (6) and the anchor plate (5) are welded to the upper end of the anchor plate (10); the anchor pipe (9) passes through the upper end of the anchor plate (10), fixes the lower end of the inclined cable through the cable anchor head (7), and connects the cable anchor head (7) to the anchor pad (8) at the lower end of the anchor pipe (9).

2. The anchoring structure of a prestressed concrete cable-stayed bridge UHPC according to claim 1, characterized in that: The box beam web (1) and the UHPC block (2) are connected to form a force-bearing whole through a tensioned prestressed steel bundle (3).

3. The anchoring structure of a prestressed concrete cable-stayed bridge UHPC according to claim 1, characterized in that: The two anchor plates (5) are connected to the UHPC block (2) through perforations via PBL shear keys (4).

4. The anchoring structure of a prestressed concrete cable-stayed bridge UHPC according to claim 1, characterized in that: The two anchor plates (5) are parallel to the anchor pipe (9).

5. The anchoring structure of a prestressed concrete cable-stayed bridge UHPC according to claim 1, characterized in that: The two anchor plates (5) are perpendicular to the edge lines of the UHPC block (2).

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