Construction method for closure section of tower column of cable-stayed bridge

Abstract

The invention discloses a cable-stayed bridge tower column closure section construction method, which belongs to the technical field of bridge construction, and comprises the following steps: during construction, self-climbing formwork frames are arranged on two sides of a tower column, and the self-climbing formwork frames are hydraulically driven to automatically climb. A tower column stiff framework and steel bars are installed through the self-climbing formwork, and concrete is poured; a tower column closure section bottom formwork system is installed on the top of the self-climbing formwork frame, a tower column stiff framework and reinforcing steel bars are installed, the self-climbing formwork frame climbs to a tower column closure section, the self-climbing formwork frame is oppositely pulled, a next section of embedded part is embedded, concrete is poured, the self-climbing formwork frame is integrally lowered by a certain distance, and the bottom formwork system is dismantled. By means of the method, the steps of formwork lifting and fixing in a traditional formwork overturning method adopted during construction of the main tower column closure section are simplified. Different construction methods are adopted according to the tower columns, the closure section of the middle tower column and the construction of the upper tower column are rapidly installed through formworks, and concrete pouring is adopted. And support can be provided through the automatic lifting formwork and the operation platform arranged on the self-climbing formwork frame.

Description

Technical Field

[0001] The invention relates to a method for constructing a closure section of a cable-stayed bridge tower column, and belongs to the technical field of bridge construction. Background Art

[0002] During the construction of traditional bridge main towers, the climbing formwork method is used in the conventional stage, and the tower column closing section is constructed by the flip formwork method, that is, the concrete tower column template is divided into a certain number of segments, and the climbing formwork is used to cast the segments from bottom to top. When constructing the segments with narrow inner space, the flip formwork method is used instead, and the reinforced concrete that has been cast below is used as the supporting body. The template is closely attached to the concrete through the tie rod, and the bonding force and friction between the lower template and the concrete are used to support the upper template and the operating platform. The template and the operating platform are raised section by section through the equipment, so that the template is continuously raised to complete the pouring of the main tower construction. When constructing the tower column closing section, the bracket and the supporting arch frame are installed through the pre-embedded climbing cone of the upper section, and the template and steel bars of the closing section are installed to complete the concrete pouring of the closing section. After closing, the upper tower column is constructed to the top of the tower using the climbing formwork.

[0003] At present, the bridge towers used in cable-stayed bridges, suspension bridges and other bridges with bridge tower structures generally have diamond-shaped, H-shaped, herringbone-shaped, A-shaped, and inverted Y-shaped shapes. This diamond-type tower column is usually equipped with two independent tower columns, which are closed at the upper and middle parts of the two tower columns by means of a crossbeam or the inclination of the tower columns themselves. During the construction of the tower columns, the installation steps of the closing section are relatively cumbersome, and high-altitude operations are dangerous, the construction speed is slow, and there are certain operational risks. Therefore, it is necessary to provide an improved technical solution to address the above-mentioned deficiencies in the prior art. Contents of the Invention

[0004] The technical problem to be solved by the present invention is to provide a method for constructing a closure section of a cable-stayed bridge tower column, which solves the problem of inconvenience in constructing a closure section of a cable-stayed bridge.

[0005] The technical problem to be solved by the present invention is achieved by adopting the following technical solution: A construction method for a cable-stayed bridge tower column closing section, comprising:

[0006] The tower column is divided into 1-31 sections, of which 1-10 sections are the lower tower column, 11-21 sections are the middle tower column, and 22-31 sections are the upper tower column.

[0007] Features:

[0008] Step 1, starting from the 1st segment, the tower column is constructed. There are two tower limbs in the 1-21 segment tower column, and the two tower limbs are combined into one tower limb in the 22nd segment;

[0009] Step 2, during construction, a self-climbing formwork is set on both sides of the tower column, a rigid frame and steel bars of the tower column are installed through the self-climbing formwork, and concrete is poured;

[0010] Step 3: Climb to the 18th segment, close the formwork, install the tie rod, embed the climbing cones required for the next segment climbing formwork, and pour the concrete for the 18th segment;

[0011] Step 4: Install the tower column rigid skeleton and steel bars on the 19th segment tower column, climb to the 19th segment through the self-climbing formwork, connect the self-climbing formwork on both sides through the crossbeam, close the formwork, install the tie rod, embed the climbing cone required for the climbing formwork of the next segment, and pour the concrete of the 19th segment;

[0012] Step 5, repeat step 4 for the 20th and 21st segments;

[0013] Step 6: In the 22nd section, the bottom formwork system is installed to the top of the self-climbing formwork, the tower column rigid skeleton and steel bars are installed, the self-climbing formwork is climbed to the 22nd section, the self-climbing formwork is pulled oppositely, the embedded parts of the next section are embedded, concrete is poured, the self-climbing formwork is lowered as a whole for a distance, and the bottom formwork system is removed;

[0014] Step 7, climbing and installing the 23-31 segment tower columns by means of the self-climbing formwork.

[0015] Preferably, the self-climbing formwork comprises an inner self-climbing formwork and an outer self-climbing formwork, and the tower column is provided with the inner self-climbing formwork and the outer self-climbing formwork during construction.

[0016] Preferably, the inner self-climbing formwork and the outer self-climbing formwork include a platform composed of multiple frames, which are, in order from bottom to top, a decoration platform, a power platform, a main operating platform, a formwork operating platform, a second steel bar binding platform, and a first steel bar binding platform.

[0017] Preferably, a power system is provided in the power platform, and the self-climbing formwork climbs through the power system.

[0018] Preferably, the power system adopts a hydraulic system to provide power.

[0019] Preferably, in step 4, the first three-layer frame platform above the inner self-climbing formwork is removed from each tower column, the self-climbing formwork is climbed to segment 19 through the power system, the two inner self-climbing formworks are connected by a crossbeam, the formwork is closed, the tie rods are installed, the embedded parts of the next segment are embedded, and concrete is poured.

[0020] Preferably, during the construction of the 21st section, the longitudinal connecting rods of the platforms in the two inner tower limbs are removed, the inner self-climbing formwork on one side is lifted to the first row of embedded climbing cones in the 20th section, the crossbeam is cut according to the center line of the tower column, the inner self-climbing formwork on the other side is lifted to the same position, the inner left and right climbing frame load-bearing tripod crossbeams and the power platform are connected, the outer self-climbing formwork is lifted as a whole to the 21st section through the power system, and the inner self-climbing frame template is simultaneously lifted to the bottom elevation of the closing section.

[0021] Preferably, the cross beam is cut according to the center line of the tower column, and the length of the cross beam is adjusted, or the cross beam is remade according to the length of the cross beam and installed.

[0022] Preferably, in step 6, the bottom formwork system comprises a steel formwork, and the bottom formwork system is fixed to the top of the inner self-climbing formwork through a flange.

[0023] Preferably, the embedded part includes a climbing cone.

[0024] The beneficial effects of the present invention are:

[0025] (1) Through the present invention, a self-climbing formwork is provided during the construction of the tower column. A decoration platform, a power platform, a main operating platform, a template operating platform, a second steel bar binding platform, and a first steel bar binding platform are provided inside the self-climbing formwork. The power platform is automatically driven by hydraulics to climb, which simplifies the steps of lifting and fixing the template in the traditional mold turning method. Different construction methods are adopted in sections according to the shapes and stress characteristics of different sections of the tower column. The closing section of the middle tower column and the upper tower column are constructed by fast template installation and concrete pouring. Lightweight materials such as wood beams, back ribs, and bamboo plywood are used in the template system, which is convenient for installation and disassembly, and has high operating efficiency. By arranging the automatic lifting template and operating platform on the self-climbing formwork, support can be provided. In the closing section, the inner self-climbing formwork of the tower columns on both sides is fixed by crossbeams, and the outer self-climbing formwork is auxiliary supported to ensure the structural stability of the closing section.

[0026] (2) Through the present invention, when the tower column is a diamond-shaped, A-shaped, herringbone-shaped, or inverted Y-shaped tower column, the self-climbing formwork method can adjust the frame and the formwork system to meet the construction requirements of different sections. When the closing section is constructed, the closing section adopts an integrated design and construction of the climbing formwork and the tower column closing section formwork, which can reduce the difficulty of template installation and ensure the accuracy and quality of the closing section construction. The formwork system and the self-climbing formwork frame are fixed by locking nuts to ensure the smoothness of the tower column appearance and the quality of concrete pouring. In the present invention, segmented casting combined with continuous climbing formwork construction is adopted to ensure the integrity and force uniformity of the tower column structure in the vertical direction.

[0027] (3) Through the present invention, by using the self-climbing formwork method for automated operation, the reliance on high-altitude workers is reduced, and the manpower requirements in the formwork disassembly and assembly process are reduced. In addition, the segmented construction method is adopted to reduce the construction period and the impact on the surrounding environment. In addition, the formwork can be reused during the construction process, reducing resource consumption and waste discharge. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a structural schematic diagram of the present invention.

[0029] Figure 2 It is a structural schematic diagram of the self-climbing formwork of the present invention.

[0030] Figure 3 It is a construction schematic diagram of the bottom of the middle tower column of the present invention.

[0031] Figure 4 The figure is a schematic diagram of the installation of the load-bearing tripod crossbeam of the present invention.

[0032] Figure 5 It is a schematic diagram of the installation of the longitudinal connecting rod of the middle platform of the present invention.

[0033] Figure 6 It is a schematic diagram of the overall installation of the load-bearing tripod crossbeam of the present invention.

[0034] Figure 7 It is an enlarged schematic diagram of the overall installation of the load-bearing tripod crossbeam of the present invention.

[0035] Figure 8 It is a schematic diagram of the construction of the top of the middle tower column of the present invention.

[0036] In the figure: 1-tower base (cap), 2-lower tower column, 3-middle tower column, 4-closing section, 41-rebar binding platform one, 42-rebar binding platform two, 43-template operation platform, 44-main operation platform, 45-power platform, 46-decoration platform, 411-load-bearing tripod crossbeam, 412-middle platform longitudinal connecting rod, 413-connecting system, 5-upper tower column. DETAILED DESCRIPTION

[0037] In order to make the technical means, creative features, objectives and effects of the present invention easier to understand, the present invention is further described below in conjunction with specific embodiments.

[0038] Example 1

[0039] like Figure 1-Figure 8 As shown, a construction method for a cable-stayed bridge tower closure section comprises:

[0040] The tower column is divided into a lower tower column 2, a middle tower column 3, and an upper tower column 5. In the present embodiment, the lower tower column 2 is fixed on a tower base (supporting platform) 1. The tower base (supporting platform) 1 is provided with a lower tower column 2 having two tower limbs. The lower tower columns 2 arranged on the tower base (supporting platform) 1 are spaced a certain distance apart, and the lower tower column 2 extends upward; in the middle tower column 3 part of the tower column, the middle tower column 3 extends upward in a tendency to fit each other; at the top of the middle tower column 3 and the bottom of the upper tower column 5, the two tower columns fit each other, and there is only one tower limb in the part of the upper tower column 5.

[0041] In this embodiment, the tower column is divided into 1-31 sections, among which sections 1-10 are the lower tower column 2, sections 11-21 are the middle tower column 2, and sections 22-31 are the upper tower column 5. Below the first section of the tower column is the tower base (cap) 1. In sections 5-18 of the tower column, the tower column is constructed by using a self-climbing formwork method for climbing, and the formwork is closed, tie rods are installed, embedded parts of the next section are embedded, and concrete is poured according to the number of sections.

[0042] In the construction of cable-stayed bridge towers, the specific construction methods are:

[0043] Step 1, in the first section, that is, the top of the tower base (cap) 1, tower column construction is carried out, two tower limbs are arranged in the 1-21 sections, and the two tower limbs are combined into one tower limb in the 22nd section.

[0044] Step 2: When constructing the tower column, a self-climbing formwork is set on both sides of the tower column, wherein the self-climbing formwork close to one end of the other tower column is the inner self-climbing formwork, and the self-climbing formwork away from the other tower column is the outer self-climbing formwork. The self-climbing formwork can be used to install a rigid skeleton and steel bars on the tower column, and concrete can be poured in sections.

[0045] Step 3, climb to the top of the 18-segment tower column, close the formwork, install the tie rods, embed the climbing cones required for the next segment climbing formwork, and pour the concrete for the 18th segment.

[0046] Step 4: Install the tower column rigid frame and steel bars in the tower column of the 19th section, climb to the 19th section of the tower column through the self-climbing formwork to provide support, use crossbeams to connect the self-climbing formworks on the inner sides of the two tower columns, close the formwork, install tie rods, embed the climbing cones required for the climbing formwork of the next section, and pour the concrete of the 19th section.

[0047] Step 5, repeat step 4 on the 20th and 21st sections of the tower column.

[0048] Step 6, in the 22nd section, install the bottom formwork system to the top of the self-climbing formwork, install the tower column rigid frame and steel bars, climb the self-climbing formwork to the 22nd section, pull the self-climbing formwork oppositely, embed the embedded parts of the next section, pour concrete, and in this section, lower the self-climbing formwork as a whole for a certain distance and remove the bottom formwork system.

[0049] Step 7, install the 23-31 segment tower columns by climbing the self-climbing formwork.

[0050] In this embodiment, the self-climbing formwork includes an inner self-climbing formwork and an outer self-climbing formwork, and the tower column is provided with the inner self-climbing formwork and the outer self-climbing formwork during construction. The self-climbing formwork at one end close to another tower column is the inner self-climbing formwork, and the self-climbing formwork at one side away from another tower column is the outer self-climbing formwork.

[0051] The structure of the inner self-climbing formwork is consistent with that of the outer self-climbing formwork, and both are provided with multiple frames. In this embodiment, the frames of the self-climbing formwork are arranged from bottom to top in the order of the modification platform 46, the power platform 45, the main operation platform 44, the template operation platform 43, the second steel bar binding platform 42, and the first steel bar binding platform 41. A power system is arranged in the power platform 45, and the self-climbing formwork is powered by the power system to control the climbing of the self-climbing formwork, and the power system is driven by hydraulic means.

[0052] In step 4, each tower leg needs to remove the first three layers of the inner self-climbing formwork from top to bottom, and use the power system to climb the self-climbing formwork to segment 19. The removed frame of the inner self-climbing formwork includes the steel bar binding platform 1 41, the steel bar binding platform 2 42, and the formwork operation platform 43. The remaining inner self-climbing formwork can still be climbed through the power platform 45. Use a crossbeam to connect the two inner self-climbing formworks of the tower column, close the formwork, install the tie rod, embed the embedded parts of the next segment, and pour the concrete of the 19th segment of the tower column.

[0053] In step 5, before pouring the concrete of segment 20, the two tower columns are close to each other, and two layers of climbing cones are pre-buried at the end of the tower column close to the other tower column. The position of the climbing cone here is the lower climbing cone. The function of the climbing cone is to serve as a fixing point for the self-climbing formwork. The fixing point is provided with a middle platform longitudinal connecting rod 412.

[0054] During the construction of the 21st segment of the tower column, it is necessary to remove the longitudinal connecting rod 412 of the platform between the two inner tower limbs, and lift one side of the inner self-climbing formwork to the first row of embedded climbing cones of the 20th segment of the tower column, cut the crossbeam according to the center line of the tower column, lift the other side of the inner self-climbing formwork to the same position, and connect the inner self-climbing formwork of the two tower columns through the crossbeam. The outer self-climbing formwork set on the two tower columns climbs to the 21st segment through the power platform 45, and simultaneously lifts the formwork structure of the inner self-climbing formwork to the bottom elevation of the closing section. Figure 8 The final structure of the inner self-climbing formwork lifting operation is as follows Figure 8 shown.

[0055] When constructing the 21st section of the tower column, when adjusting the length of the beam, the beam can be cut according to the center line of the tower column, the length of the beam can be adjusted, or the beam can be remade according to the length of the beam and installed in the inner self-climbing formwork.

[0056] In step 6, the 22nd section of the tower column, in this section, the self-climbing formwork is lowered a certain distance as a whole, and the bottom formwork system is removed. The distance the self-climbing formwork is lowered is 10 cm, and the bottom formwork system of the closing section is removed to complete the construction of the closing section.

[0057] In this embodiment, the bottom formwork system includes a steel formwork, and the bottom formwork system is fixed to the top of the inner climbing formwork frame through a flange. The embedded parts of the next segment include an M42 climbing cone.

[0058] The 21st segment of the tower column is the closing segment, where two tower columns are close to each other and closed to form a tower limb. By adjusting the structure of the inner self-climbing formwork of the tower column in the closing segment, support is provided for the closing segment, making it easier for the tower column to be closed.

[0059] In this embodiment, the brittle skeleton of the tower column is a frame structure composed of welded angle steels, which assists in the reinforcement binding of the tower column.

[0060] The formwork is set in the formwork operating platform 43. In this embodiment, the formwork is a structure composed of wood beams, back ribs, and bamboo board glue. The function of shaping and pouring concrete is to control the backward movement device of the formwork operating platform 43 after climbing the self-climbing formwork frame to fit the formwork to the already tied steel cage.

[0061] In this embodiment, in step 6, the self-climbing formwork is raised to the 22nd segment, and the self-climbing formwork is pulled oppositely. The step of pulling the self-climbing formwork oppositely is specifically that the two ends of the full-length tie rod respectively pass through the back rib of the formwork, and then are locked and fixed with butterfly nuts.

[0062] The basic principles, main features and advantages of the present invention are shown and described above. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention. The scope of the present invention is defined by the attached claims and their equivalents.

Claims

1. A method for constructing a closure section of a cable-stayed bridge tower column, comprising: The tower column is divided into 1-31 sections, wherein sections 1-10 are lower tower columns, sections 11-21 are middle tower columns, and sections 22-31 are upper tower columns. Features: Step 1, starting the tower column construction from the 1st segment, there are two tower limbs in the 1-21 segment tower column, and the two tower limbs are combined into one tower limb in the 22nd segment; Step 2, during construction, a self-climbing formwork is set on both sides of the tower column, a tower column rigid skeleton and steel bars are installed through the self-climbing formwork, and concrete is poured; Step 3: Climb to the 18th segment, close the formwork, install the tie rod, embed the climbing cones required for the next segment climbing formwork, and pour the concrete for the 18th segment; Step 4, installing the tower column rigid skeleton and steel bars on the 19th segment tower column, climbing to the 19th segment through the self-climbing formwork, connecting the self-climbing formwork on both sides through the crossbeam, closing the formwork, installing the tie rod, pre-embedding the climbing cones required for the climbing formwork of the next segment, and pouring the concrete of the 19th segment; Step 5, repeat step 4 for the 20th and 21st segments; Step 6: In the 22nd section, the bottom formwork system is installed to the top of the self-climbing formwork, the tower column rigid skeleton and steel bars are installed, the self-climbing formwork is climbed to the 22nd section, the self-climbing formwork is pulled oppositely, the embedded parts of the next section are embedded, concrete is poured, the self-climbing formwork is lowered as a whole for a distance, and the bottom formwork system is removed; Step 7, climbing and installing the 23-31 segment tower columns by means of the self-climbing formwork.

2. A cable-stayed bridge tower closure section construction method according to claim 1, characterized in that: The self-climbing formwork frame comprises an inner self-climbing formwork frame and an outer self-climbing formwork frame. The tower column is provided with the inner self-climbing formwork frame and the outer self-climbing formwork frame during construction.

3. A cable-stayed bridge tower closure section construction method according to claim 2, characterized in that: The inner self-climbing formwork and the outer self-climbing formwork include platforms composed of multiple frames, which are, in order from bottom to top, a decoration platform, a power platform, a main operating platform, a formwork operating platform, a second steel bar binding platform, and a first steel bar binding platform.

4. A cable-stayed bridge tower closure section construction method according to claim 3, characterized in that: A power system is arranged in the power platform, and the self-climbing formwork climbs through the power system.

5. A cable-stayed bridge tower closure section construction method according to claim 4, characterized in that: The power system adopts a hydraulic system to provide power.

6. A cable-stayed bridge tower closure section construction method according to any one of claims 1 to 5, characterized in that: In step 4, the first three-layer frame platform above the inner self-climbing formwork is removed from each tower column, and the self-climbing formwork is climbed to segment 19 through the power system. The two inner self-climbing formworks are connected by a crossbeam, the formwork is closed, the tie rods are installed, the embedded parts of the next segment are embedded, and concrete is poured.

7. A cable-stayed bridge tower closure section construction method according to any one of claims 1 to 5, characterized in that: During the construction of the 21st section, the longitudinal connecting rods of the platforms in the two inner tower limbs are removed, and the inner self-climbing formwork on one side is lifted to the first row of embedded climbing cones in the 20th section. The crossbeam is cut according to the center line of the tower column, and the inner self-climbing formwork on the other side is lifted to the same position. The inner left and right climbing frame load-bearing tripod crossbeams and the power platform are connected, and the outer self-climbing formwork is lifted as a whole to the 21st section through the power system, and the inner self-climbing frame template is simultaneously lifted to the bottom elevation of the closing section.

8. A cable-stayed bridge tower closure section construction method according to claim 7, characterized in that: Cut the beams along the center line of the tower column, adjust the length of the beams, or remake and install the beams according to the length of the beams.

9. The method for constructing a cable-stayed bridge tower closure section according to claim 2, characterized in that: In step 6, the bottom formwork system includes a steel formwork, and the bottom formwork system is fixed to the top of the inner self-climbing formwork through a flange.

10. A cable-stayed bridge tower closure section construction method according to claim 6, characterized in that: The embedded part includes a climbing cone.

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