A method for constructing super-high main tower of cable-stayed bridge

Abstract

The present application discloses a method for constructing a super-high main tower of a cable-stayed bridge, which comprises the following steps: forming a tower column starting section by casting; then assembling climbing formwork structures on the outer peripheries of the two tower column starting sections respectively, the climbing formwork structures forming a casting cavity at the top of the tower column, setting a truss on the top of the two climbing formwork structures, forming a new lower tower column section by casting in the casting cavity, then lifting the truss, and the truss drives the two climbing formwork structures to move up to the construction position of the next section of the tower column, and then performing casting construction, and repeating the steps until the construction of the lower tower column is completed; then building a construction platform between the two lower tower columns, and completing the casting construction of the lower crossbeam on the tops of the two lower tower columns; repeating the above operations to complete the climbing formwork casting construction of the middle tower column and the casting construction of the middle crossbeam, and finally completing the climbing formwork casting construction of the upper tower column. The present application has the effect of reducing the adverse effects on the tower body during the construction process.

Description

Technical Field

[0001] The present application relates to the field of cable-stayed bridge main tower construction, and in particular to a method for constructing a super-high main tower of a cable-stayed bridge. Background Art

[0002] A cable-stayed bridge is a type of bridge that uses many cables to pull the main beam directly onto the bridge tower. It is a structural system that is composed of a compression tower, tension cables, and a bending beam. The main tower of a cable-stayed bridge is mainly a reinforced concrete tower. The tower shapes include H-shaped, inverted Y-shaped, A-shaped, and vase-shaped.

[0003] At present, in the vase-shaped super-high main tower structure, from bottom to top, there are tower piers, lower tower columns, lower crossbeams, middle tower columns, upper crossbeams and upper tower columns. The two lower tower columns are arranged on both sides of the upper surface of the tower piers. The lower crossbeam spans and connects the tops of the two lower tower columns. The two middle tower columns are cast on the tops of the two lower tower columns and extend upward. The upper crossbeam spans and connects the tops of the two middle tower columns. The two upper tower columns are cast on the tops of the middle tower columns. At present, the tower columns are constructed with hydraulic self-climbing formwork. The power source of the hydraulic self-climbing formwork is its own hydraulic jacking system. The hydraulic jacking system includes a hydraulic cylinder and upper and lower reversing boxes. The reversing box can control the lifting guide rail or the lifting frame. The hydraulic system can form mutual climbing between the template frame and the guide rail, so that the hydraulic self-climbing formwork can climb upward.

[0004] Regarding the above-mentioned related technologies, there are the following defects: since the two tower columns are constructed independently and tilted outward, and the hydraulic self-climbing formwork system has many components and is heavy, during the pouring construction, the self-weight of the climbing formwork and the load generated by the construction have a great impact on the tower column and tower body, which can easily cause structural changes in the tower body structure and pose safety issues. Therefore, there is still room for improvement. Summary of the invention

[0005] In order to reduce the adverse effects on the tower body during the construction process, the present application provides a method for constructing a super-high main tower of a cable-stayed bridge.

[0006] The present application provides a method for constructing a super-high main tower of a cable-stayed bridge using the following technical solution:

[0007] A method for constructing a super-high main tower of a cable-stayed bridge comprises the following steps:

[0008] S1: Casting construction of the lower tower column starting section: first, build two tower column starting section templates on the pier, and cast the tower column starting section in the templates. After the tower column starting section is cast and formed, remove the templates;

[0009] S2: Climbing formwork pouring construction of the lower tower column: Climbing formwork structures are assembled on the outer periphery of the starting sections of the two tower columns respectively, and the climbing formwork structures form a pouring cavity at the top of the tower column. Trusses are placed on the tops of the two climbing formwork structures, and the tops of the two climbing formwork structures are respectively slidably connected to the bottoms of the trusses. The sliding directions of the climbing formwork structures are consistent with the length directions of the trusses. The inclination directions of the two climbing formwork structures are respectively toward the outsides of the lower tower columns. By pouring in the pouring cavity, a new lower tower column section is formed, and then the trusses are hoisted. The trusses drive the two climbing formwork structures to move up to the construction position of the next section of the tower column, and then pouring construction is carried out. The steps are repeated until the construction of the lower tower column is completed;

[0010] S3: Casting of lower cross beam: After the construction of the lower tower column is completed, continue to raise the truss height until the climbing formwork structure is separated from the lower tower column, then build a construction platform between the two lower tower columns, and complete the casting of the lower cross beam on the top of the two lower tower columns;

[0011] S4: Climbing formwork pouring construction of the middle tower column: first, complete the construction of the starting section of the middle tower column on the top of the lower crossbeam, then reassemble the climbing formwork structure and the truss, swap the positions of the climbing formwork structures at both ends of the truss, so that the inclination directions of the two climbing formwork structures are respectively toward the inside of the middle tower column, and install the climbing formwork structures at both ends of the truss at the starting sections of the two middle tower columns, and form a pouring cavity at the top of the middle tower column, and form a new middle tower column section by pouring in the pouring cavity, and then lift the truss, and the truss drives the two climbing formwork structures to move up to the construction position of the next section of the middle tower column, and then perform pouring construction, and repeat the steps until the construction of the middle tower column is completed;

[0012] S5: Casting of the middle cross beam: Build a construction platform above the lower cross beam and complete the casting of the middle cross beam on the top of the two middle tower columns;

[0013] S6: Climbing formwork pouring construction of upper tower column: complete the construction of upper tower column above the middle cross beam.

[0014] By adopting the above technical solution, two climbing formwork structures are connected by a truss, and the climbing formwork structure is driven to rise by moving the truss upward. The truss shares the weight of the climbing formwork structure and reduces the load on the tower column. When the tower column tends to tilt downward, the truss can play a lifting role, which is beneficial to reducing the adverse effects on the tower body during construction. In addition, replacing the hydraulic climbing formwork with an upward lifting method can increase the climbing formwork rising speed, which is beneficial to improving the climbing formwork construction efficiency.

[0015] Preferably, the climbing formwork structure includes a first support platform, four side formworks and four driving members. A first through groove runs through the middle of the first support platform. The four side formworks are respectively slidably connected to the upper surface of the first support platform. The four side formworks are arranged around the outer circumference of the first through groove. Four driving members correspond to the four side formworks one by one. The driving members are used to drive the corresponding side formworks toward or away from the first through groove. When the lower tower column is cast, the starting section of the lower tower column passes through the first through groove, and the driving member drives the side formwork to move toward the first through groove until the inner side of the side formwork abuts against the outer wall of the starting section of the lower tower column, and the four side formworks form a casting cavity above the starting section of the lower tower column.

[0016] By adopting the above technical solution, the first through groove plays a positioning and guiding role for the climbing formwork structure. Driven by the driving member, the side formwork moves stably and rests against the outer wall of the starting section of the lower tower column, thereby forming a casting cavity for casting construction at the upper end of the starting section of the lower tower column.

[0017] Preferably, the climbing formwork structure also includes a second support platform, which is located below the first support platform. A second through groove is opened in the middle of the second support platform. The first support platform and the second support platform are connected by a connecting rod to form an operating platform between the first support platform and the second support platform.

[0018] By adopting the above technical solution, the gap between the first support platform and the second support platform forms a construction platform, which can be used by construction workers to carry out construction processing on the surface of the tower column.

[0019] Preferably, during the climbing formwork casting construction of the lower tower column of S2, a guide rail is first fixed on the outer wall of the starting section of the lower tower column, the length direction of the guide rail is consistent with the extension direction of the lower tower column, and a guide block is provided on the inner wall of the second through groove, and the guide block is slidably connected to the guide rail; every time the climbing formwork structure rises a section, the guide rail is installed on the outer wall of the lower tower column that has just been cast at the construction platform of the climbing formwork structure to complete the guide rail extension step.

[0020] By adopting the above technical solution, the guide rail plays a guiding role, so that the climbing formwork structure can move along the extension direction of the tower column, which is beneficial to improving the straightness of the climbing formwork structure and reducing construction deviations.

[0021] Preferably, a T-shaped slot is provided at the bottom of the truss, and the T-shaped slot extends along the length direction of the truss. A connecting column is vertically arranged on the upper end surface of the first support platform, and a T-shaped block is connected to the top of the connecting column, and the T-shaped block is slidably connected to the T-shaped slot.

[0022] The adoption of the above technical solution is beneficial to improving the movement stability of the climbing formwork structure on the truss.

[0023] Preferably, the T-shaped groove is connected to the end of the truss.

[0024] By adopting the above technical solution, the assembly and disassembly between the climbing formwork structure and the truss are facilitated, so that the positions of the two climbing formwork structures can be replaced during the crossbeam casting construction in S4.

[0025] Preferably, before lifting the truss, the end openings of the T-slots are blocked.

[0026] By adopting the above technical solution, the probability of the climbing formwork structure detaching from high altitude can be reduced during the tower column casting construction, which is conducive to improving construction safety.

[0027] Preferably, the driving member is a hydraulic cylinder, one end of which is hinged to the first support platform, and the end of the hydraulic cylinder away from the first support platform is hinged with a dovetail block, a dovetail block is provided on the back side of the side template, the dovetail block extends vertically, and the dovetail block is slidably connected to the dovetail groove.

[0028] By adopting the above technical solution, the driving component can push and pull back the side template, thereby improving the mold closing and demoulding efficiency of the climbing mold mechanism.

[0029] In summary, the present application includes at least one of the following beneficial technical effects:

[0030] 1. Use trusses to connect the two climbing formwork structures. The trusses move upward to drive the climbing formwork structure to rise. The trusses share the weight of the climbing formwork structure and reduce the load on the tower column. When the tower column tends to tilt downward, the trusses can play a lifting role, which is beneficial to reduce the adverse effects on the tower body during construction. In addition, the upward lifting method replaces the hydraulic climbing formwork method, which can increase the climbing formwork rising speed and help improve the climbing formwork construction efficiency.

[0031] 2. During the climbing formwork casting construction of the middle tower column, first complete the construction of the starting section of the middle tower column on the top of the lower crossbeam, then reassemble the climbing formwork structure and the truss, swap the positions of the climbing formwork structures at both ends of the truss, and make the inclination directions of the two climbing formwork structures face the inner side of the middle tower column respectively, so as to facilitate the change of the tower column construction angle and improve the construction flexibility. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is a structural schematic diagram of a main tower in a method for constructing a super-high main tower of a cable-stayed bridge according to an embodiment of the present application.

[0033] Figure 2 It is a schematic diagram of the construction status of the lower tower column in a method for constructing a super-high main tower of a cable-stayed bridge in an embodiment of the present application.

[0034] Figure 3 yes Figure 2 A magnified schematic diagram of center A.

[0035] Figure 4 It is a structural schematic diagram between a climbing formwork structure and a truss in a method for constructing a super-high main tower of a cable-stayed bridge in an embodiment of the present application.

[0036] Explanation of the reference numerals in the accompanying drawings: 1. Pier; 2. Lower tower column; 21. Guide rail; 3. Lower crossbeam; 4. Middle tower column; 5. Upper crossbeam; 6. Upper tower column; 7. Climbing formwork structure; 71. Side formwork; 711. Dovetail groove; 72. Hydraulic cylinder; 73. First supporting platform; 731. Connecting column; 732. T-block; 733. First through groove; 74. Second supporting platform; 741. Second through groove; 742. Guide block; 75. Connecting rod; 76. Operating platform; 8. Truss; 81. T-slot; 9. Tower crane; 10. Casting cavity. DETAILED DESCRIPTION

[0037] The following is combined with Figure 1-4 This application is described in further detail.

[0038] The present application embodiment discloses a method for constructing a super-high main tower of a cable-stayed bridge. The construction method of the present application takes a vase-shaped main tower as the main construction body, and refers to Figure 1 The structure of the main tower is, from bottom to top, a tower pier, a lower tower column 2, a lower crossbeam 3, a middle tower column 4, an upper crossbeam 5, and an upper tower column 6. Two lower tower columns 2 are arranged on both sides of the upper surface of the tower pier, and the two lower tower columns 2 are inclined outward. The lower crossbeam 3 spans and connects the tops of the two lower tower columns 2. The two middle tower columns 4 are cast on the tops of the two lower tower columns 2 and extend upward. The two middle tower columns 4 are inclined inward. The upper crossbeam 5 spans and connects the tops of the two middle tower columns 4. The two upper tower columns 6 are cast vertically on the tops of the middle tower columns 4, and the upper tower columns 6 are relatively low in height.

[0039] A method for constructing a super-high main tower of a cable-stayed bridge comprises the following steps:

[0040] S1: Casting construction of the starting section of the lower tower column 2: first build two templates for the starting section of the lower tower column 2 on the pier 1, and cast the starting section of the lower tower column 2 in the templates. After the starting section of the lower tower column 2 is cast and formed, remove the templates to provide installation space for the climbing formwork structure 7.

[0041] S2: Climbing formwork casting construction of lower tower column 2: Assemble climbing formwork structures 7 on the outer periphery of the starting sections of the two tower columns respectively.

[0042] Reference Figure 2 and Figure 3 Specifically, the climbing formwork structure 7 includes a first support platform 73, a second support platform 74, four side formworks 71 and four driving members. Among them, the driving member is a hydraulic cylinder 72. The first support platform 73 and the second support platform 74 are distributed up and down and connected by a connecting rod 75. The gap between the first support platform 73 and the second support platform 74 is used as an operating platform 76 for construction workers to perform construction operations.

[0043] Reference Figure 3 and Figure 4A T-shaped slot 81 is provided at the bottom of the truss 8, and the T-shaped slot 81 extends along the length direction of the truss 8. A connecting column 731 is vertically provided on the upper end surface of the first support platform 73, and a T-shaped block 732 is connected to the top of the connecting column 731, and the T-shaped block 732 is slidably connected to the T-shaped slot 81. The T-shaped slot 81 is connected to the end of the truss 8 to facilitate the connection between the T-shaped block 732 and the T-shaped slot 81. After the connection is completed, the end opening of the T-shaped slot 81 is blocked.

[0044] In addition, a first through groove 733 runs through the middle of the first support platform 73, and a second through groove 741 runs through the middle of the second support platform 74. When the climbing formwork structure 7 is assembled at the starting section of the tower column, the starting section of the lower tower column 2 passes through the second through groove 741 and the first through groove 733 from bottom to top in sequence. The first through groove 733 and the second through groove 741 play a positioning and guiding role for the climbing formwork structure 7.

[0045] In addition, in order to improve the moving stability of the climbing formwork structure 7, the construction workers install the guide rail 21 on the outer wall of the starting section of the lower tower column 2 on the operating platform 76. In addition, a guide block 742 is provided on the inner wall of the second through groove 741. The guide block 742 is slidably connected to the guide rail 21, and the length direction of the guide rail 21 is consistent with the extension direction of the lower tower column 2.

[0046] Slide blocks are provided on the lower sides of the four side templates 71, and four slide grooves are provided on the upper surface of the first support platform. The four slide grooves are distributed in a cross shape and circumferentially distributed around the first through groove 733. The side template 71 is slidably connected to the slide groove on the upper surface of the first support platform 73 through the slide block. The four side templates 71 are arranged around the outer periphery of the first through groove 733. The four hydraulic cylinders 72 correspond to the four side templates 71 one by one to drive the corresponding side templates 71 to move closer to or away from the first through groove 733. Specifically, one end of the hydraulic lever is hinged to the first support platform 73, and the end of the hydraulic lever away from the first support platform 73 is hinged with a dovetail block, and a dovetail block is provided on the back side of the side template 71. The dovetail block extends vertically and is slidably connected to the dovetail groove 711.

[0047] Before the casting construction of the lower tower column 2, the hydraulic cylinder 72 drives the side formwork 71 to move toward the first through groove 733 until the inner side of the side formwork 71 abuts against the outer wall of the starting section of the lower tower column 2, and the four side formworks 71 form a casting cavity 10 above the starting section of the lower tower column 2. At this time, the two climbing formwork structures 7 are inclined toward the outside of the lower tower column 2, and a new lower tower column 2 section is formed by casting in the casting cavity 10. Then the tower crane 9 is used to lift the truss 8, and the truss 8 drives the two climbing formwork structures 7 to move up to the construction position of the next section of the tower column. Then the casting construction is carried out to complete the construction of one section of the lower tower column 2. Then repeat the above steps until the construction of the lower tower column 2 is completed.

[0048] S3: Casting construction of lower cross beam 3: After the construction of lower tower column 2 is completed, continue to increase the height of truss 8 until climbing formwork structure 7 is separated from lower tower column 2, then build a construction platform between the two lower tower columns 2, and complete the casting construction of lower cross beam 3 on the top of the two lower tower columns 2.

[0049] S4: Climbing formwork casting construction of middle tower column 4: first complete the construction of the starting section of the middle tower column 4 on the top of the lower cross beam 3, then reassemble the climbing formwork structure 7 and the truss 8, swap the positions of the climbing formwork structures 7 at both ends of the truss 8, so that the inclination directions of the two climbing formwork structures 7 are respectively toward the inner side of the middle tower column 4, and install the climbing formwork structures 7 at both ends of the truss 8 at the starting sections of the two middle tower columns 4 respectively, and form a casting cavity 10 on the top of the middle tower column 4, and form a new middle tower column 4 section by casting in the casting cavity 10, and then lift the truss 8, and the truss 8 drives the two climbing formwork structures 7 to move up to the construction position of the next section of the middle tower column 4, and then carry out casting construction, and repeat the above steps until the construction of the middle tower column 4 is completed.

[0050] S5: Casting construction of the middle cross beam: Build a construction platform above the lower cross beam 3 and complete the casting construction of the middle cross beam on the top of the two middle tower columns 4.

[0051] S6: Climbing formwork casting construction of upper tower column 6: The construction of upper tower column 6 is completed above the middle crossbeam. In the application itself, due to the low height of the upper tower column 6, the formwork can be directly built and cast directly without the use of climbing formwork structure 7.

[0052] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A method for constructing a super-high main tower of a cable-stayed bridge, characterized in that: The following steps are involved: S1: Casting construction of the starting section of the lower tower column (2): first, two templates for the starting sections of the tower columns are built on the bridge pier (1), and the starting sections of the tower columns are cast in the templates. After the starting sections of the tower columns are cast and formed, the templates are removed; S2: Climbing formwork casting construction of the lower tower column (2): Climbing formwork structures (7) are assembled on the outer periphery of the starting sections of the two tower columns respectively, and the climbing formwork structures (7) form a casting cavity (10) at the top of the tower column. A truss (8) is set on the top of the two climbing formwork structures (7). The tops of the two climbing formwork structures (7) are respectively slidably connected to the bottoms of the trusses (8). The sliding direction of the climbing formwork structures (7) is consistent with the length direction of the trusses (8). The inclination directions of the two climbing formwork structures (7) are respectively toward the outside of the lower tower column (2). By casting in the casting cavity (10), a new section of the lower tower column (2) is formed, and then the truss (8) is hoisted. The truss (8) drives the two climbing formwork structures (7) to move up to the construction position of the next section of the tower column, and then the casting construction is carried out. The steps are repeated until the construction of the lower tower column (2) is completed; The climbing formwork structure (7) comprises a first support platform (73), four side formworks (71) and four driving members, a first through slot (733) running through the middle of the first support platform (73), the four side formworks (71) are respectively slidably connected to the upper surface of the first support platform (73), the four side formworks (71) are arranged around the outer periphery of the first through slot (733), the four driving members correspond to the four side formworks (71) one by one, and the driving members are used to drive the corresponding side formworks (71) to move towards or away from the first through slot (733); when the lower tower column (2) is cast, the starting section of the lower tower column (2) passes through the first through slot (733), and the driving member drives the side formwork (71) to move towards the first through slot (733) until the inner side of the side formwork (71) abuts against the outer wall of the starting section of the lower tower column (2), and the four side formworks (71) form a casting cavity (10) above the starting section of the lower tower column (2); The climbing formwork structure (7) further comprises a second support platform (74), the second support platform (74) being located below the first support platform (73), a second through slot (741) being provided in the middle of the second support platform (74), the first support platform (73) and the second support platform (74) being connected via a connecting rod (75), and an operating platform (76) being formed between the first support platform (73) and the second support platform (74); During the casting construction of the lower tower column (2) of S2 by the climbing formwork, the guide rail (21) is first fixed on the outer wall of the starting section of the lower tower column (2), the length direction of the guide rail (21) is consistent with the extension direction of the lower tower column (2), and the inner wall of the second through groove (741) is provided with a guide block (742), and the guide block (742) is slidably connected to the guide rail (21); each time the climbing formwork structure (7) rises a section, the guide rail (21) is installed on the outer wall of the lower tower column (2) that has just been cast at the construction platform of the climbing formwork structure (7), so as to complete the step of extending the guide rail (21); A T-shaped groove (81) is provided at the bottom of the truss (8), and the T-shaped groove (81) extends along the length direction of the truss (8). A connecting column (731) is vertically provided on the upper end surface of the first support platform (73), and a T-shaped block (732) is connected to the top end of the connecting column (731), and the T-shaped block (732) is slidably connected to the T-shaped groove (81); S3: Casting construction of the lower cross beam (3): After the construction of the lower tower column (2) is completed, the height of the truss (8) is continuously raised until the climbing formwork structure (7) is separated from the lower tower column (2), and then a construction platform is built between the two lower tower columns (2), and the casting construction of the lower cross beam (3) is completed on the top of the two lower tower columns (2); S4: Climbing formwork pouring construction of the middle tower column (4): first, the construction of the starting section of the middle tower column (4) is completed on the top of the lower cross beam (3), and then the climbing formwork structure (7) and the truss (8) are reassembled, and the positions of the climbing formwork structures (7) at both ends of the truss (8) are exchanged so that the inclination directions of the two climbing formwork structures (7) are respectively directed toward the inner side of the middle tower column (4), and the climbing formwork structures (7) at both ends of the truss (8) are respectively installed at the starting sections of the two middle tower columns (4), and a pouring cavity (10) is formed at the top of the middle tower column (4), and a new middle tower column (4) section is formed by pouring in the pouring cavity (10), and then the truss (8) is hoisted, and the truss (8) drives the two climbing formwork structures (7) to move up to the construction position of the next section of the middle tower column (4), and then the pouring construction is carried out, and the steps are repeated until the construction of the middle tower column (4) is completed; S5: Casting of the middle cross beam: Building a construction platform above the lower cross beam (3), and completing the casting of the middle cross beam on the top of the two middle tower columns (4); S6: Climbing formwork casting construction of the upper tower column (6): The construction of the upper tower column (6) is completed above the middle cross beam.

2. A method for constructing a super-high main tower of a cable-stayed bridge according to claim 1, characterized in that: The T-shaped groove (81) is communicated with the end of the truss (8).

3. A method for constructing a super-high main tower of a cable-stayed bridge according to claim 2, characterized in that: Before lifting the truss (8), the end opening of the T-slot (81) is blocked.

4. The method for constructing a super-high main tower of a cable-stayed bridge according to claim 1, characterized in that: The driving member is a hydraulic cylinder (72), one end of which is hinged to the first support platform (73), and one end of the hydraulic cylinder (72) away from the first support platform (73) is hinged to a dovetail block, and a dovetail block is provided on the back side of the side template (71), the dovetail block extends vertically, and the dovetail block is slidably connected to the dovetail groove (711).

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