A tooth block and pull rod combined cable tower anchoring structure for a cable-stayed bridge

Abstract

The present invention discloses a tooth block and pull rod combined cable tower anchoring structure of a cable-stayed bridge, comprising a cable tower, a cable anchoring tooth block is arranged on the inner side of the tower wall along the bridge direction of the cable tower, a cable pre-buried pipe is arranged in the front and rear tower walls of the cable tower, an anchor pad for anchoring the cable is arranged at the intersection of the upper end of the pre-buried pipe and the upper tooth surface of the anchor tooth block, and a steel pull rod placed along the bridge direction is arranged in the cable tower, the steel pull rod connects the lower tooth surfaces of the two tooth blocks and is distributed on both sides of the cable pre-buried pipe. Slow-bonding prestressed steel bundles are arranged in the four tower walls of the cable tower. In the present invention, the tooth block is combined with the steel pull rod, and the force is transmitted together with the tower wall and the tooth block through the shear key. The present invention abandons the high-altitude grouting operation with difficult quality control, avoids the cutting of the tower column longitudinal reinforcement by the anchor hole, is convenient for construction, easy to control quality, improves the force performance of the cable tower anchoring, improves the construction quality of the cable tower anchoring structure, and improves the economy of the structure, and has promotion significance.

Description

Technical Field

[0001] The invention belongs to the technical field of cable-stayed bridge tower anchoring structures, and in particular relates to a tooth block and pull rod combined type tower anchoring structure of a cable-stayed bridge. Background Art

[0002] The anchoring structure of cable-stayed bridge towers usually uses concrete tooth blocks or steel anchor beams. Among them, the concrete tooth blocks completely bear the cable force by the tower wall. A large number of prestressed steel strands need to be configured in the tower wall to resist the horizontal component of the cable force. The high-altitude tensioning and grouting operations are large, and the setting of anchor holes will cut off a large number of longitudinal force-bearing steel bars in the main tower, posing quality and safety risks. The steel anchor beam relies on the steel anchor beam to bear most of the horizontal component of the cable force, and relies on the tower wall to bear the unbalanced cable force. There are relatively few prestressed steel strands in the tower wall, but the amount of steel used is large, the steel anchor beam structure is complex, the manufacturing, hoisting and positioning are difficult, the maintenance workload during the operation period is large, and the bracket needs to be set in the tower wall, and the overall economic efficiency is poor. Summary of the invention

[0003] The present invention is proposed to solve the problems existing in the prior art, and its purpose is to provide a tooth block and pull rod combined cable tower anchor structure which has simple structure, convenient construction, easy quality control, can also serve as a maintenance platform support and has excellent economy.

[0004] The technical solution of the present invention is: a tooth block and tie rod combined cable tower anchoring structure of a cable-stayed bridge, comprising a cable tower, characterized in that: a cable anchoring tooth block is arranged on the inner side of the tower wall along the bridge direction of the cable tower, and a cable embedded pipe is arranged in the front and rear tower walls of the cable tower, and an anchor pad for anchoring the cable is arranged at the intersection of the upper end of the embedded pipe and the upper tooth surface of the anchoring tooth block, and a steel tie rod placed along the bridge direction is arranged in the cable tower, and both ends of the steel tie rod are anchored in the front and rear tower walls and the tooth block.

[0005] Furthermore, the embedded pipes are horizontally arranged on both sides of the tower wall correspondingly, and an anchor plate is arranged between the embedded pipes and the upper tooth surface.

[0006] Furthermore, the steel tie rods are grouped in pairs to form a tie rod group, and the two steel tie rods in the tie rod group are arranged on both sides of the embedded pipe.

[0007] Furthermore, a tooth block angular line is formed between the upper tooth surface and the lower tooth surface, and the top end of the steel pull rod is located below the tooth block angular line.

[0008] Furthermore, both ends of the steel tie rod are anchored to the tower wall, and the ear plate in the steel tie rod is anchored to the lower tooth surface.

[0009] Furthermore, the steel tie rod includes a steel section, which is composed of an upper flange plate, a lower flange plate, and a web plate. Cylindrical head shear nails are provided at the upper end of the upper flange plate and the lower end of the lower flange plate, and the cylindrical head shear nails are used to anchor the steel section to the tower wall.

[0010] Furthermore, an ear plate is arranged at the outer wall of the steel section, the ear plate is fitted with the lower tooth surface, and a cylindrical head shear nail for fixing the ear plate with the lower tooth plate is arranged at the side wall of the ear plate.

[0011] Furthermore, the ear plate is fixed to the upper flange plate, the lower flange plate and the web plate.

[0012] Furthermore, a plurality of separately arranged slow-bonding prestressed steel strands are provided in the cable tower, a PBL shear key hole is formed in the web of the steel section, and the slow-bonding prestressed steel strands pass through the PBL shear key hole.

[0013] Furthermore, longitudinal stress-bearing steel bars are arranged in the cable tower, and the anchor holes of the tensioning ends of the slow-bonding prestressed steel strands are arranged between the longitudinal stress-bearing steel bars of the tower column.

[0014] The tooth block of the present invention is combined with the steel rod, and a slow-bonding prestressed steel bundle is used in the tower wall, and the force is transmitted by combining with the tower wall and the tooth block through the shear key. The slow-bonding steel bundle without grouting is arranged in a single root, which avoids cutting the longitudinal reinforcement of the tower column. The steel rod is adjusted in specifications according to the force requirements to determine the proportion of the cable force to be borne, which is conducive to reducing the amount of steel bundles and steel used in the tower wall and simplifying the structure. At the same time, the steel rod serves as the main support of the maintenance platform in the tower.

[0015] The present invention abandons the high-altitude grouting operation with difficult quality control, avoids the cutting of the tower column longitudinal reinforcement by the anchor hole, is convenient to construct, and easy to control the quality. It improves the stress performance of the cable tower anchoring, improves the construction quality of the cable tower anchoring structure, and improves the economy of the structure, and has promotion significance. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the planar structure of the present invention;

[0017] Figure 2 It is a schematic diagram of the elevation structure of the present invention;

[0018] Figure 3 It is a structural schematic diagram of the medium-sized steel tie rod of the present invention;

[0019] Figure 4 is a three-dimensional diagram of the medium-sized steel tie rod of the present invention;

[0020] in:

[0021] 1 Tower wall 2 Slow-bonded prestressed steel strands

[0022] 3 Cable anchoring tooth block 4 Anchor plate

[0023] 5 Pre-buried pipe 6 Steel tie rod

[0024] 7 Longitudinal stress reinforcement

[0025] 6-1 Steel 6-2 Ear Plate

[0026] 6-3 Cylindrical head shear stud 6-4 PBL shear key hole. DETAILED DESCRIPTION

[0027] Hereinafter, the present invention will be described in detail with reference to the accompanying drawings and embodiments:

[0028] like Figures 1 to 4 As shown, a tooth block and tie rod combined cable tower anchoring structure of a cable-stayed bridge includes a cable tower, and is characterized in that: a cable anchoring tooth block 3 is arranged on the inner side of the tower wall 1 along the bridge direction of the cable tower, and a cable embedded pipe 5 is arranged in the front and rear tower walls 1 of the cable tower, and an anchor pad 4 for anchoring the cable is arranged at the intersection of the upper end of the embedded pipe 5 and the upper tooth surface of the anchoring tooth block 3, and a steel tie rod 6 placed along the bridge direction is arranged in the cable tower, and both ends of the steel tie rod 6 are anchored in the front and rear tower walls and the tooth blocks.

[0029] The embedded pipes 5 are horizontally arranged on both sides of the tower wall 1 in correspondence with each other, and an anchor plate 4 is arranged between the embedded pipes 5 and the upper tooth surface.

[0030] The steel tie rods 6 are grouped in pairs to form a tie rod group, and the two steel tie rods 6 in the tie rod group are arranged on both sides of the embedded pipe 5.

[0031] A tooth block angular line is formed between the upper tooth surface and the lower tooth surface, and the top end of the steel pull rod 6 is located below the tooth block angular line.

[0032] Both ends of the steel tie rod 6 are anchored to the tower wall 1 , and the ear plate 6 - 2 in the steel tie rod 6 is anchored to the lower tooth surface.

[0033] The steel tie rod 6 includes a steel 6-1, which is composed of an upper flange plate, a lower flange plate, and a web plate. Cylindrical head shear nails 6-3 are arranged at the upper end of the upper flange plate and the lower end of the lower flange plate. The cylindrical head shear nails 6-3 are used to anchor the steel 6-1 to the tower wall 1.

[0034] The outer wall of the steel section 6-1 is provided with an ear plate 6-2, the ear plate 6-2 is in contact with the lower tooth surface, and the side wall of the ear plate 6-2 is provided with a cylindrical head shear nail 6-3 for fixing with the lower tooth plate.

[0035] The ear plate 6-2 is fixed to the upper flange plate, the lower flange plate and the web plate.

[0036] The cable tower is provided with a plurality of separately arranged slow-bonding prestressed steel strands 2, a PBL shear key hole 6-4 is formed in the web of the steel section 6-1, and the slow-bonding prestressed steel strands 2 pass through the PBL shear key hole 6-4.

[0037] The cable tower is provided with longitudinal stress-bearing steel bars 7, and the anchor holes of the tensioning ends of the slow-bonding prestressed steel strands 2 are arranged between the longitudinal stress-bearing steel bars 7 of the tower column.

[0038] The anchor holes of the tensioning ends of the slow-bonding prestressed steel strands 2 are arranged between the longitudinal stress-bearing steel bars 7 of the tower column, so that the longitudinal stress-bearing steel bars 7 of the tower column do not need to be cut off, and no grouting operation is required after the tensioning is completed.

[0039] Preferably, the vertical distance between the upper end surface of the steel tie rod 6 and the corner line of the tooth block is 0.2m.

[0040] The cylindrical head shear nail 6-3 is fixed to the upper flange plate, the lower flange plate and the ear plate 6-2 by welding.

[0041] Preferably, the upper flange plate, the lower flange plate and the web plate are an integral structure or are fixed by welding, and the upper flange plate, the lower flange plate and the web plate may be, but are not limited to, an I-shaped structure or a grooved structure.

[0042] Correspondingly, full penetration butt welding is adopted between the upper flange plate, the lower flange plate and the web plate in the steel tie rod 6, and arc stud welding is adopted between the cylindrical head shear nail and the upper flange plate, the lower flange plate and the ear plate 6-2. The steel tie rod 6 is first processed with the PBL shear key hole 6-4, and then the ear plate 6-2 and the cylindrical head shear nail 6-3 are welded, and finally the whole is hoisted to the specified position of the tower column.

[0043] The steel section 6-1 is spatially positioned before pouring the concrete tower wall, and the slow-bonding prestressed steel strand 2 is arranged after the ordinary steel bars are tied.

[0044] Yet another embodiment

[0045] A tooth block and tie rod combined cable tower anchoring structure of a cable-stayed bridge comprises a cable tower, and is characterized in that: a cable anchoring tooth block 3 is arranged on the inner side of a tower wall 1 along the bridge direction of the cable tower, and a cable embedded pipe 5 is arranged in the front and rear tower walls 1 of the cable tower, and an anchor pad 4 for anchoring the cable is arranged at the intersection of the upper end of the embedded pipe 5 and the upper tooth surface of the anchoring tooth block 3, and a steel tie rod 6 placed along the bridge direction is arranged in the cable tower, and both ends of the steel tie rod 6 are anchored in the front and rear tower walls and the tooth blocks.

[0046] The embedded pipes 5 are horizontally arranged on both sides of the tower wall 1 in correspondence with each other, and an anchor plate 4 is arranged between the embedded pipes 5 and the upper tooth surface.

[0047] The steel tie rods 6 are grouped in pairs to form a tie rod group, and the two steel tie rods 6 in the tie rod group are arranged on both sides of the embedded pipe 5.

[0048] A tooth block angular line is formed between the upper tooth surface and the lower tooth surface, and the top end of the steel pull rod 6 is located below the tooth block angular line.

[0049] Both ends of the steel tie rod 6 are anchored to the tower wall 1 , and the ear plate 6 - 2 in the steel tie rod 6 is anchored to the lower tooth surface.

[0050] The steel tie rod 6 includes a steel 6-1, which is composed of an upper flange plate, a lower flange plate, and a web plate. Cylindrical head shear nails 6-3 are arranged at the upper end of the upper flange plate and the lower end of the lower flange plate. The cylindrical head shear nails 6-3 are used to anchor the steel 6-1 to the tower wall 1.

[0051] The outer wall of the steel section 6-1 is provided with an ear plate 6-2, the ear plate 6-2 is in contact with the lower tooth surface, and the side wall of the ear plate 6-2 is provided with a cylindrical head shear nail 6-3 for fixing with the lower tooth plate.

[0052] The ear plate 6-2 is fixed to the upper flange plate, the lower flange plate and the web plate.

[0053] The cable tower is provided with a plurality of separately arranged slow-bonding prestressed steel strands 2, a PBL shear key hole 6-4 is formed in the web of the steel section 6-1, and the slow-bonding prestressed steel strands 2 pass through the PBL shear key hole 6-4.

[0054] The cable tower is provided with longitudinal stress-bearing steel bars 7, and the anchor holes of the tensioning ends of the slow-bonding prestressed steel strands 2 are arranged between the longitudinal stress-bearing steel bars 7 of the tower column.

[0055] The anchor holes of the tensioning ends of the slow-bonding prestressed steel strands 2 are arranged between the longitudinal stress-bearing steel bars 7 of the tower column, so that the longitudinal stress-bearing steel bars 7 of the tower column do not need to be cut off, and no grouting operation is required after the tensioning is completed.

[0056] Preferably, the vertical distance between the upper end surface of the steel tie rod 6 and the corner line of the tooth block is 0.2m.

[0057] The cylindrical head shear nail 6-3 is fixed to the upper flange plate, the lower flange plate and the ear plate 6-2 by welding.

[0058] Preferably, the upper flange plate, the lower flange plate and the web plate are an integral structure or are fixed by welding, and the upper flange plate, the lower flange plate and the web plate may be, but are not limited to, an I-shaped structure or a grooved structure.

[0059] Correspondingly, full penetration butt welding is adopted between the upper flange plate, the lower flange plate and the web plate in the steel tie rod 6, and arc stud welding is adopted between the cylindrical head shear nail and the upper flange plate, the lower flange plate and the ear plate 6-2. The steel tie rod 6 is first processed with the PBL shear key hole 6-4, and then the ear plate 6-2 and the cylindrical head shear nail 6-3 are welded, and finally the whole is hoisted to the specified position of the tower column.

[0060] The steel section 6-1 is spatially positioned before pouring the concrete tower wall, and the slow-bonding prestressed steel strand 2 is arranged after the ordinary steel bars are tied.

[0061] The portion of the upper flange plate in the steel section 6-1 that is exposed from the cable tower serves as the foundation for building a cable tower maintenance platform, thereby achieving an optimized design for later maintenance based on the combination of fixation.

[0062] The installation process of the present invention is as follows:

[0063] Step 1: Process and manufacture the steel rod 6 according to the design requirements. First, process the steel 6-1, then process the PBL shear key hole 6-4, and then weld the ear plate 6-2 and the cylindrical head shear nail 6-3.

[0064] Step 2: After the steel tie rod 6 is welded in the factory, it is transported to the construction site and hoisted to the designated position of the tower column segment by a tower crane.

[0065] Step 3: Then complete the installation of the embedded pipes of the inclined cables, the binding of ordinary steel bars, the arrangement of the slow-bonding prestressed steel strands 2 and the erection of the formwork, and then carry out concrete pouring and maintenance.

[0066] Step 4: Complete the tensioning of the tower wall slow-bonding steel bundle 2 and the construction of the maintenance platform, and repeat the above construction process.

[0067] After installation, the tower wall 1, the slow-bonding prestressed steel strand 2, the cable anchoring tooth block 3 and the steel rod 6 jointly bear the cable force, among which the tower wall 1, the slow-bonding steel strand 2 and the cable anchoring tooth block 3 bear relatively more horizontal component and all vertical components of the cable force, and the steel rod 6 bears relatively less horizontal component of the cable force.

[0068] The tooth block of the present invention is combined with the steel rod, and a slow-bonding prestressed steel bundle is used in the tower wall, and the force is transmitted by combining with the tower wall and the tooth block through the shear key. The slow-bonding steel bundle without grouting is arranged in a single root, which avoids cutting the longitudinal reinforcement of the tower column. The steel rod is adjusted in specifications according to the force requirements to determine the proportion of the cable force to be borne, which is conducive to reducing the amount of steel bundles and steel used in the tower wall and simplifying the structure. At the same time, the steel rod serves as the main support of the maintenance platform in the tower.

[0069] The present invention abandons the high-altitude grouting operation with difficult quality control, avoids the cutting of the tower column longitudinal reinforcement by the anchor hole, is convenient to construct, and easy to control the quality. It improves the stress performance of the cable tower anchoring, improves the construction quality of the cable tower anchoring structure, and improves the economy of the structure, and has promotion significance.

Claims

1. A tooth block and pull rod combined cable tower anchoring structure of a cable-stayed bridge, comprising a cable tower, characterized in that: A cable anchoring tooth block (3) is arranged on the inner side of the tower wall (1) in the direction of the bridge of the cable tower, a cable pre-buried pipe (5) is arranged in the front and rear tower walls (1) of the cable tower, an anchor pad (4) for anchoring the cable is arranged at the intersection of the upper end of the pre-buried pipe (5) and the upper tooth surface of the cable anchoring tooth block (3), and a steel tie rod (6) placed in the direction of the bridge is arranged in the cable tower, and both ends of the steel tie rod (6) are anchored in the front and rear tower walls and the cable anchoring tooth block (3); Both ends of the steel tie rod (6) are anchored to the tower wall (1), and the ear plate (6-2) in the steel tie rod (6) is anchored to the lower tooth surface; The steel tie rod (6) comprises a steel section (6-1), the steel section (6-1) being composed of an upper flange plate, a lower flange plate, and a web plate, cylindrical head shear nails (6-3) being provided at the upper end of the upper flange plate and the lower end of the lower flange plate, the cylindrical head shear nails (6-3) being used for anchoring the steel section (6-1) to the tower wall (1); The outer wall of the steel section (6-1) is provided with an ear plate (6-2), the ear plate (6-2) is in contact with the lower tooth surface, and the side wall of the ear plate (6-2) is provided with a cylindrical head shear nail (6-3) for fixing the ear plate to the lower tooth surface; The upper flange plate, the lower flange plate and the web plate are an integrated structure or are welded and fixed, and the upper flange plate, the lower flange plate and the web plate are an I-shaped structure; The steel tie rods (6) are grouped in pairs to form a tie rod group, and the two steel tie rods (6) in the tie rod group are arranged on both sides of the embedded pipe (5); A tooth block angular line is formed between the upper tooth surface and the lower tooth surface, the top end of the steel tie rod (6) is located below the tooth block angular line, and the vertical distance between the upper end surface of the steel tie rod (6) and the tooth block angular line is 0.2 m; A plurality of independently arranged slow-bonding prestressed steel strands (2) are arranged in the cable tower, a PBL shear key hole (6-4) is formed in the web of the steel section (6-1), and the slow-bonding prestressed steel strands (2) pass through the PBL shear key hole (6-4).

2. The tooth block and pull rod combined tower anchoring structure of a cable-stayed bridge according to claim 1, characterized in that: The embedded pipes (5) are arranged horizontally and correspondingly on both sides of the tower wall (1), and an anchor plate (4) is arranged between the embedded pipes (5) and the upper tooth surface.

3. The tooth block and pull rod combined tower anchoring structure of a cable-stayed bridge according to claim 1, characterized in that: The ear plate (6-2) is fixed to the upper flange plate, the lower flange plate, and the web plate.

4. The tooth block and pull rod combined tower anchoring structure of a cable-stayed bridge according to claim 1, characterized in that: Longitudinal stress-bearing steel bars (7) are arranged in the cable tower, and the tensioning end anchor holes of the slow-bonding prestressed steel strand (2) are arranged between the longitudinal stress-bearing steel bars (7) of the tower column.

Images