Prefabricated and assembled cable-stayed bridge concrete cable tower structure and construction method

Abstract

The invention discloses a structure of a prefabricated and assembled cable-stayed bridge concrete cable bent tower and a construction method. The problems that a traditional concrete cable bent tower structure is large in cast-in-place workload and long in construction period, and the quality is not easy to guarantee are solved. According to the technical scheme, a cable bent tower foundation, a cable bent tower bearing platform and a cable bent tower body are sequentially arranged from bottom to top; the cable bent tower body is composed of a lower tower column, a middle tower column and an upper tower column. A tower bottom cast-in-place section is arranged between the bottom of the lower tower column and the cable bent tower bearing platform, the lower tower column and the middle tower column are each composed of a plurality of tower column sections, and the upper tower column is composed of a plurality of anchoring sections. A main beam is arranged in the middle of the middle tower column; each tower column section is composed of two first precast block sections and two second precast block sections; the first precast block sections and the second precast block sections are alternately arranged and spliced into a quadrangular frustum pyramid-shaped structure; the anchoring section is of a quadrangular frustum pyramid structure formed by splicing a third prefabricated block section and a fourth prefabricated block section. Stay cables are arranged on the two sides, adjacent to the splicing seam, of the anchoring section.

Description

Technical Field

[0001] The invention belongs to the technical field of civil engineering bridges, and in particular relates to a structure and a construction method of a prefabricated assembled cable-stayed bridge concrete tower. Background Art

[0002] The statements in this section merely provide background information related to the present invention and do not necessarily constitute prior art.

[0003] Bridges are used in highway, railway, urban road and water conservancy infrastructure construction to cross rivers or other structures and other obstacles. Cable-stayed bridges are bridges with pylons, cables and main beams as the main load-bearing components. They are cable-bearing bridges with a span capacity second only to suspension bridges. The pylons of cable-stayed bridges are the main load-bearing components. They are mainly subjected to eccentric pressure and are generally made of concrete, steel tube concrete, steel and other materials with high compressive strength. Concrete pylons have high rigidity and are relatively economical in cost. They account for the largest proportion of large-span cable-stayed bridges and are the most widely used.

[0004] Although there are a large number of application projects of concrete cable towers of cable-stayed bridges, in general, the current traditional concrete cable towers of cable-stayed bridges are constructed by conventional slipform or flipform on-site casting. However, when the span of the cable-stayed bridge exceeds a certain length or the height of the cable tower exceeds a certain height, there are super-high cable towers that need to be cast on-site, which requires a large number of on-site personnel, a large workload of high-altitude operations, a long time, and great safety risks. The efficiency of slipform or flipform on-site casting drops sharply, the construction period is long, and the cost increases sharply. At the same time, the on-site casting of super-high cable towers is greatly affected by environmental factors, and the quality is difficult to guarantee. The structure has many durability defects, which affects the life of the bridge. Summary of the invention

[0005] In view of the above problems, the present invention provides a structure and construction method for a prefabricated assembled cable-stayed bridge concrete cable tower, which improves the rapid construction capability of the cable tower from the aspects of structural construction and internal force mechanism, and overcomes the problems of large workload, long construction period and difficult quality assurance in on-site casting of traditional concrete cable tower structures.

[0006] In order to achieve the above object, the present invention is implemented through the following technical solutions:

[0007] In a first aspect, the present invention provides a structure of a prefabricated assembled cable-stayed bridge concrete tower, comprising:

[0008] The tower foundation, tower cap and tower body are arranged in sequence from bottom to top;

[0009] The tower body of the cable tower is composed of a lower tower column, a middle tower column and an upper tower column; a tower bottom cast-in-place section is arranged between the bottom of the lower tower column and the cable tower cap, the lower tower column and the middle tower column are composed of a plurality of tower column segments, and the upper tower column is composed of a plurality of anchoring segments; a main beam is arranged in the middle of the middle tower column;

[0010] The tower column segment is composed of two first prefabricated blocks and two second prefabricated blocks; the first prefabricated blocks and the second prefabricated blocks are both L-shaped structures, the first prefabricated blocks and the second prefabricated blocks are alternately arranged and spliced ​​into a four-sided pyramid structure, and the splicing seam is also inclined at a set angle relative to the plumb line;

[0011] The anchoring segment has two U-shaped prefabricated block segments, namely the third prefabricated block segment and the fourth prefabricated block segment. The third prefabricated block segment and the fourth prefabricated block segment are spliced ​​into a four-sided pyramid structure, and the splicing seam is inclined at a set angle relative to the plumb line; inclined cables are arranged on both sides of the third prefabricated block segment and the fourth prefabricated block segment adjacent to the splicing seam.

[0012] Furthermore, the first prefabricated block segment, the second prefabricated block segment, the third prefabricated block segment and the second prefabricated block segment are provided with block segment splicing anchor blocks on the inner and outer sides of the segments at the splicing seams, and the splicing anchor blocks are provided with block segment prestressed bundles for splicing between the prefabricated block segments.

[0013] Furthermore, the first prefabricated block segments and the second prefabricated block segments of the tower column segments adjacent to each other are arranged alternately, and the two ends of the first prefabricated block segments are provided with concave seams, and the two ends of the second prefabricated block segments are provided with convex seams.

[0014] Furthermore, the third prefabricated block segments and the fourth prefabricated block segments of the upper and lower adjacent anchoring segments are arranged alternately, and both ends of the third prefabricated block segment are provided with concave seams, and both ends of the fourth prefabricated block segment are provided with convex seams.

[0015] Furthermore, a trapezoidal boss is provided at the connection between the tower column segment and the anchoring segment in the height direction, pin holes are provided in the trapezoidal boss at a certain interval, and positioning steel pins are provided in the pin holes for guiding and positioning.

[0016] Furthermore, cast-in-place wet joints are provided on the outer and inner sides of the tower columns of the trapezoidal bosses at the connections of the tower column segments in the height direction and the anchor segments in the height direction; and segment vertical main reinforcements are provided on the tower column segments and the anchor segments in the height direction of the wet joints.

[0017] Furthermore, the concrete strength grade of the wet joint is not lower than the concrete strength grade of the prefabricated block segment.

[0018] Furthermore, the third prefabricated block segment and the fourth prefabricated block segment in the anchoring segment are provided with a stay cable anchor block for anchoring the stay cable.

[0019] Furthermore, a horizontal plate is provided at the lower end of the inclined cable anchor block, and a cable anchor prestressed bundle is provided in the horizontal plate for bearing the tension of the inclined cable.

[0020] In a second aspect, the present invention further provides a construction method for a prefabricated assembled cable-stayed bridge concrete tower structure, the specific steps comprising:

[0021] S1. construct the tower foundation at the tower position, and construct the tower cap on the tower foundation; at the same time, prefabricate the first and second prefabricated blocks of the lower tower column and the middle tower column from bottom to top, as well as the third and fourth prefabricated blocks of the upper tower column;

[0022] S2. Cast the cast-in-place section of the bottom of the tower column on the cable tower cap, embed the vertical main reinforcement of the tower column, and trim the trapezoidal boss at the wet joint;

[0023] S3. Insert a positioning steel pin into the pin hole of the trapezoidal boss and apply structural adhesive to the top surface of the trapezoidal boss;

[0024] S4. Hoist the first prefabricated block of the tower column segment, apply structural glue to the joint groove, then hoist the second prefabricated block of the tower column segment, insert the block prestressed beam into the block segment splicing anchor block, and tension, anchor, and grout, complete the connection between the prefabricated blocks, until the set number of tower column segments are completed; for the upper tower column, after the third prefabricated block segment and the fourth prefabricated block segment are connected, insert the cable anchor prestressed beam at the horizontal plate, tension, anchor, and grout;

[0025] S5. Connect the vertical main reinforcement in the segment wet joints between the several tower column segments and the anchor segments, and tie other reinforcements in the corresponding positions, then pour the segment wet joint concrete to complete the connection between the several tower column segments and the anchor segments;

[0026] Repeat S3 to S5 to complete the assembly construction of the lower tower column, the middle tower column, and the upper tower column from top to bottom.

[0027] Compared with the prior art, the present invention has the following advantages and positive effects:

[0028] The tower column segments and anchoring segments of the present invention are divided into 4 or 2 prefabricated blocks for assembly construction, which reduces the weight of a single prefabricated block, facilitates implementation, and improves the adaptability to super-high cable towers and large-sized cable towers; the joints between the prefabricated blocks are inclined to ensure the connection strength; since the concrete cable tower is assembled from multiple prefabricated blocks, it can be prefabricated under factory environmental conditions, which is easy to improve the quality of concrete, and its shrinkage creep is completed in the free state of the prefabricated blocks, the shrinkage self-stress is reduced or even eliminated, and only a small number of segment wet joints are cast on site during on-site hoisting, which significantly improves the construction efficiency, shortens the construction period, greatly reduces the workload and personnel input of high-altitude operations, and is more green and environmentally friendly.

[0029] The boss and positioning steel pin structure between each segment of the present invention make it easier to hoist the prefabricated block segment into place, the accuracy of docking with the vertical main reinforcement of the completed segment is better, and the docking operation of the main reinforcement is more convenient; the upper tower column inclined cable anchorage area adopts prefabricated horizontal plates and prestressing force, which not only makes the splicing between the blocks tighter, but also balances the tension of the inclined cable, realizes concrete prestressed anchoring, and saves a lot of steel and subsequent maintenance costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] The accompanying drawings in the specification, which constitute a part of the present invention, are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention.

[0031] Figure 1 This is a schematic diagram of the overall structure of the concrete tower of the prefabricated assembled cable-stayed bridge of the present invention;

[0032] Figure 2 It is a schematic structural diagram of each prefabricated block segment of the tower column segments of the lower and middle tower columns of the present invention;

[0033] Figure 3 It is a cross-sectional structural diagram of each prefabricated block segment of the tower column segment of the lower and middle tower columns of the present invention;

[0034] Figure 4 It is a schematic diagram of the structure of the prefabricated block segment of the anchoring segment of the upper tower column of the present invention;

[0035] Figure 5 It is a schematic diagram of the vertical cross-section structure of the segment wet joint between the upper and lower segments of the present invention;

[0036] Figure 6 It is a partial schematic diagram of the vertical section of the segment wet joint between the upper and lower segments of the present invention.

[0037] In the figure: 1. lower tower column; 2. middle tower column; 3. upper tower column; 4. tower column segment; 5. anchor segment; 6. first precast block segment; 7. second precast block segment; 8. third precast block segment; 9. fourth precast block segment; 10. block segment splicing anchor block; 11. notched joint; 12. convex joint; 13. wet joint; 14. trapezoidal boss; 15. block segment prestressed beam; 16. cable anchor prestressed beam; 17. vertical main reinforcement; 18. cable tower foundation; 19. cable tower pedestal; 20. cast-in-place section of tower bottom; 21. positioning steel pins; 22. horizontal plate; 23. main beam; 24. inclined cable; 25. inclined cable anchor block. DETAILED DESCRIPTION

[0038] It should be noted that the following detailed descriptions are illustrative and intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used in the present invention have the same meanings as those commonly understood by those skilled in the art to which the present invention belongs.

[0039] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present invention. As used herein, unless otherwise explicitly stated in the present invention, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "include" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof;

[0040] In order to solve the above technical problems, the structure of the present invention is further described below in conjunction with the accompanying drawings; the structure of a prefabricated assembled cable-stayed bridge concrete tower of the present invention is more concise, the force is more clear, and it has better prefabrication and factory construction conditions, such as Figure 1-Figure 6As shown, it includes: a cable tower foundation 18, a cable tower cap 19 and a cable tower body are arranged in sequence from bottom to top; the cable tower body is composed of a lower tower column 1, a middle tower column 2 and an upper tower column 3; a tower bottom cast-in-place section 20 is arranged between the bottom of the lower tower column 1 and the cable tower cap 19, the lower tower column 1 and the middle tower column 2 are composed of a plurality of tower column segments 4, and the upper tower column 3 is composed of a plurality of anchoring segments 5; a main beam 23 is arranged in the middle position of the middle tower column 2; the tower column segment 4 is composed of two first prefabricated block segments 6 and two second prefabricated block segments 7; the first prefabricated block segment 6 and The second prefabricated block sections 7 are all L-shaped structures, the first prefabricated block sections 6 and the second prefabricated block sections 7 are arranged alternately and spliced ​​into a four-prism-shaped structure, and the splicing seam is also inclined at a set angle relative to the plumb line; the anchoring segment 5 has two U-shaped prefabricated block sections, namely the third prefabricated block section 8 and the fourth prefabricated block section 9, the third prefabricated block section 8 and the fourth prefabricated block section 9 are spliced ​​into a four-prism-shaped structure, and the splicing seam is inclined at a set angle relative to the plumb line; inclined cables 24 are arranged on both sides of the third prefabricated block section 8 and the fourth prefabricated block section 9 adjacent to the splicing seam.

[0041] The first prefabricated block segment 6, the second prefabricated block segment 7, the third prefabricated block segment 8 and the second prefabricated block segment 7 are provided with block segment splicing anchor blocks 10 on the inner and outer sides of the segments at the splicing seams, and the splicing anchor blocks are provided with prestressed block segment prestressed beams 15 for splicing the prefabricated block segments between the prefabricated block segments. The splicing between the prefabricated block segments is achieved by prestressing, anchoring and grouting the block segment prestressed beams 15.

[0042] The first prefabricated block segments 6 and the second prefabricated block segments 7 of the upper and lower adjacent tower column segments 4 are arranged alternately, and the two ends of the first prefabricated block segments 6 are provided with concave seams 11, and the two ends of the second prefabricated block segments 7 are provided with convex seams 12.

[0043] The third prefabricated block segments 8 and the fourth prefabricated block segments 9 of the upper and lower adjacent anchoring segments 5 are arranged alternately, and the two ends of the third prefabricated block segments 8 are provided with concave seams 11, and the two ends of the fourth prefabricated block segments 9 are provided with convex seams 12.

[0044] A trapezoidal boss 14 is provided at the connection between the tower column segment 4 and the anchoring segment 5 in the height direction. Pin holes are provided in the trapezoidal boss 14 at a certain interval. Positioning steel pins 21 are provided in the pin holes for guiding and positioning.

[0045] Cast-in-place wet joints 13 are provided on the outer and inner sides of the tower column of the trapezoidal bosses 14 at the connection of the tower column segment 4 in the height direction and the connection of the anchor segment 5 in the height direction; segment vertical main reinforcement 17 is provided on the tower column segment 4 and the anchor segment 5 in the height direction of the wet joint 13.

[0046] The concrete strength grade of the wet joint 13 is not lower than the concrete strength grade of the prefabricated block segment.

[0047] The third prefabricated block segment 8 and the fourth prefabricated block segment 9 in the anchoring segment 5 are provided with a stay cable anchor block 25 for anchoring the stay cable 24 .

[0048] A horizontal plate 22 is provided at the lower end of the inclined cable anchor block 25, and a cable anchor prestressed bundle 16 is provided in the horizontal plate 22. After the splicing between the third prefabricated block section 8 and the fourth prefabricated block section 9 is completed, the cable anchor prestressed bundle 16 is tensioned, anchored and grouted, so that the cable anchor prestressed bundle 16 bears the tension of the inclined cable 24.

[0049] The present invention also provides a construction method for a prefabricated assembled cable-stayed bridge concrete tower structure, the specific steps comprising:

[0050] S1. construct a tower foundation 18 at the tower position, and construct a tower cap 19 on the tower foundation 18; at the same time, prefabricate the first prefabricated block section 6 and the second prefabricated block section 7 of the lower tower column 1 and the middle tower column 2 from bottom to top, and the third prefabricated block section 8 and the fourth prefabricated block section 9 of the upper tower column 3;

[0051] S2. Casting the cast-in-place section 20 of the bottom of the tower column 1 on the cable tower cap 19, and pre-embed the vertical main reinforcement 17 of the tower column, and trimming the trapezoidal boss 14 at the wet joint 13;

[0052] S3. Insert the positioning steel pin 21 into the pin hole of the trapezoidal boss 14, and apply structural adhesive to the top surface of the trapezoidal boss 14;

[0053] S4. Hoist the first prefabricated block 6 of the tower column segment 4, apply structural glue to the joint groove, then hoist the second prefabricated block 7 of the tower column segment 4, insert the block prestressed beam 15 into the block segment splicing anchor block 10, and tension, anchor, and grout to complete the connection between the prefabricated blocks, until the set number of tower column segments 4 are completed; for the upper tower column 3, after the third prefabricated block 8 and the fourth prefabricated block 9 are connected, insert the cable anchor prestressed beam 16 at the horizontal plate 22, tension, anchor, and grout;

[0054] S5. Connecting several tower column segments 4 and the vertical main reinforcement 17 in the wet joint 13 between the anchor segment 5, and tying other steel bars in the corresponding parts, pouring the segment wet joint 13 concrete to complete the connection between several tower column segments 4 and the anchor segment 5;

[0055] Repeat S3 to S5 to complete the assembly construction of the lower tower column 1, the middle tower column 2, and the upper tower column 3 from top to bottom.

[0056] Although the above describes the specific implementation mode of the present invention in conjunction with the accompanying drawings, it is not intended to limit the scope of protection of the present invention. Those skilled in the art should understand that various modifications or variations that can be made by those skilled in the art on the basis of the technical solution of the present invention without creative work are still within the scope of protection of the present invention.

Claims

1. A structure of a prefabricated assembled cable-stayed bridge concrete tower, characterized in that: include: The tower foundation, tower cap and tower body are arranged in sequence from bottom to top; The tower body of the cable tower is composed of a lower tower column, a middle tower column and an upper tower column; a tower bottom cast-in-place section is arranged between the bottom of the lower tower column and the cable tower cap, the lower tower column and the middle tower column are composed of a plurality of tower column segments, and the upper tower column is composed of a plurality of anchoring segments; a main beam is arranged in the middle of the middle tower column; The tower column segment is composed of two first prefabricated blocks and two second prefabricated blocks; the first prefabricated blocks and the second prefabricated blocks are both L-shaped structures, the first prefabricated blocks and the second prefabricated blocks are alternately arranged and spliced ​​into a four-sided pyramid structure, and the splicing seam is also inclined at a set angle relative to the plumb line; The anchoring segment has two U-shaped prefabricated block segments, namely the third prefabricated block segment and the fourth prefabricated block segment. The third prefabricated block segment and the fourth prefabricated block segment are spliced ​​into a four-sided pyramid structure, and the splicing seam is inclined at a set angle relative to the plumb line; inclined cables are arranged on both sides of the third prefabricated block segment and the fourth prefabricated block segment adjacent to the splicing seam.

2. The structure of a prefabricated assembled cable-stayed bridge concrete tower as claimed in claim 1, characterized in that: The first prefabricated block segment, the second prefabricated block segment, the third prefabricated block segment and the second prefabricated block segment are provided with block segment splicing anchor blocks on the inner and outer sides of the segments at the splicing seams, and the splicing anchor blocks are provided with block segment prestressed bundles for splicing between the prefabricated block segments.

3. The structure of a prefabricated assembled cable-stayed bridge concrete tower as claimed in claim 1, characterized in that: The first prefabricated block segments and the second prefabricated block segments of the tower column segments adjacent to each other are arranged alternately, and both ends of the first prefabricated block segments are provided with concave joints, and both ends of the second prefabricated block segments are provided with convex joints.

4. The structure of a prefabricated assembled cable-stayed bridge concrete tower as claimed in claim 1, characterized in that: The third prefabricated block segments and the fourth prefabricated block segments of the upper and lower adjacent anchoring segments are arranged alternately, and both ends of the third prefabricated block segment are provided with concave seams, and both ends of the fourth prefabricated block segment are provided with convex seams.

5. The structure of a prefabricated assembled cable-stayed bridge concrete tower as claimed in claim 1, characterized in that: A trapezoidal boss is provided at the connection between the tower column segment and the anchoring segment in the height direction, pin holes are provided in the trapezoidal boss at a certain interval, and positioning steel pins are provided in the pin holes for guiding and positioning.

6. The structure of a prefabricated assembled cable-stayed bridge concrete tower as claimed in claim 1, characterized in that: Cast-in-place wet joints are provided on the outer and inner sides of the tower column of the trapezoidal bosses at the connection points of the tower column segments in the height direction and the connection points of the anchor segments in the height direction; segment vertical main reinforcements are provided on the tower column segments and the anchor segments in the height direction of the wet joints.

7. The structure of a prefabricated assembled cable-stayed bridge concrete tower as claimed in claim 6, characterized in that: The concrete strength grade of the wet joint is not lower than the concrete strength grade of the prefabricated block segment.

8. The structure of a prefabricated assembled cable-stayed bridge concrete tower as claimed in claim 7, characterized in that: The third prefabricated block segment and the fourth prefabricated block segment in the anchoring segment are provided with stay cable anchor blocks for anchoring the stay cables.

9. The structure of a prefabricated assembled cable-stayed bridge concrete tower as claimed in claim 8, characterized in that: A horizontal plate is arranged at the lower end of the inclined cable anchor block, and a cable anchor prestressed bundle is arranged in the horizontal plate for bearing the tension of the inclined cable.

10. A construction method for a prefabricated and assembled cable-stayed bridge concrete tower structure as claimed in any one of claims 1 to 9, characterized in that: The steps include: S1. construct the tower foundation at the tower position, and construct the tower cap on the tower foundation; at the same time, prefabricate the first and second prefabricated blocks of the lower tower column and the middle tower column from bottom to top, as well as the third and fourth prefabricated blocks of the upper tower column; S2. Cast the cast-in-place section of the bottom of the tower column on the cable tower cap, and embed the vertical main reinforcement of the tower column, and trim the trapezoidal boss at the wet joint; S3. Insert a positioning steel pin into the pin hole of the trapezoidal boss and apply structural adhesive to the top surface of the trapezoidal boss; S4. Hoist the first prefabricated block of the tower column segment, apply structural glue to the joint groove, then hoist the second prefabricated block of the tower column segment, insert the block prestressed beam into the block segment splicing anchor block, and tension, anchor, and grout, complete the connection between the prefabricated blocks, until the set number of tower column segments are completed; for the upper tower column, after the third prefabricated block segment and the fourth prefabricated block segment are connected, insert the cable anchor prestressed beam at the horizontal plate, tension, anchor, and grout; S5. Connect the vertical main reinforcement in the segment wet joints between the several tower column segments and the anchor segments, and tie other reinforcements in the corresponding positions, then pour the segment wet joint concrete to complete the connection between the several tower column segments and the anchor segments; Repeat S3 to S5 to complete the assembly construction of the lower tower column, the middle tower column, and the upper tower column from top to bottom.

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