A construction method for realizing accurate positioning and closure of high-tower steel tower segments

Abstract

The application discloses a construction method for realizing accurate positioning and closure of a high-tower-column steel tower segment, and comprises the following steps: S1, installing a main transverse support at a third segment concrete tower column at the top, which is used for adjusting the deviation of the concrete tower column during construction; S2, installing four ladder-shaped steel support piers on the left and right tower limb steel-mixing combined segments, the steel support piers are installed in pairs on the corresponding steel-mixing combined segments, three-way jacks are placed on each steel support pier, the starting segment steel tower column is lifted up, the starting segment steel tower column is named as ST1, and the accurate positioning of the starting segment steel tower column is realized through the three-way jacks. The application is suitable for the construction method for accurately positioning and closure of a super-high cable-stayed bridge steel tower column. The construction method can improve the installation accuracy of the steel tower column, guarantees the overall linear type of the tower column, and improves the construction quality.

Description

Technical Field

[0001] This invention relates to the field of steel tower construction for cable-stayed bridges. More specifically, this invention relates to a construction method for achieving precise positioning and closure of steel tower segments in high-rise bridges. Background Technology

[0002] The traditional construction process for high-rise steel tower sections involves hoisting the steel tower sections onto the tower column. Approximately 1 meter from the target position, the tower's position is adjusted using traction ropes. Once the position is confirmed, the traction ropes are anchored, and the tower is lowered. However, this traditional traction rope method has limitations. When the tower is installed too high, there is insufficient space for the traction ropes to be anchored, and the positioning accuracy of the tower cannot be guaranteed. Furthermore, the overall alignment and attitude of the tower column cannot be effectively controlled. Summary of the Invention

[0003] The purpose of this invention is to provide a construction method for achieving precise positioning and closure of steel tower segments in high-rise cable-stayed bridges, applicable to the precise positioning and closure of steel tower segments in ultra-high cable-stayed bridges. This construction method improves the installation accuracy of the steel tower segments, ensures the overall alignment of the tower segments, and enhances construction quality.

[0004] The technical solution adopted by this invention to solve this technical problem is: a construction method for achieving precise positioning and closure of steel tower segments in high-rise columns, comprising the following steps:

[0005] S1. Install active cross bracing at the top third section of the concrete tower column to adjust for any deviation that occurs during the construction of the concrete tower column.

[0006] S2. Four stepped steel supports are installed on the steel-concrete composite sections of the left and right tower legs. The steel supports are installed in pairs on the corresponding steel-concrete composite sections. Three-way jacks are placed on each steel support to lift the starting segment steel tower column. The starting segment steel tower column is named ST1. The starting segment steel tower column is precisely adjusted by the three-way jacks. If the elevation is not met, steel plates can be placed on the steel supports.

[0007] S3. After the initial section of the steel tower of a single tower leg is adjusted, the pre-reserved limiting steel on the bearing plate is initially welded to the steel support on the transverse passage platform at the top of the steel support. After the measurement and verification meet the requirements, the four limiting steels are then firmly welded together. The welds must meet the requirements of the drawings.

[0008] S4. The second section of the steel tower column is named ST2, and so on. When installing ST2, the double-layer cross bracing is installed simultaneously. First, connect the temporarily locked ST1 to the double-layer cross bracing with a pin, and then adjust ST2 to ensure that the pin can be inserted.

[0009] S5. The matching and alignment device is transported to the construction site and installed at the corresponding steel tower position before hoisting to align the horizontal circumferential joints and vertical welds of the steel tower, thereby realizing the installation and alignment adjustment of the steel tower.

[0010] Preferably, the active cross brace includes a first steel pipe and a second steel pipe, and several first steel pipes arranged at intervals are connected into a whole by the second steel pipes, with the two ends of the first steel pipes facing the third concrete tower column on both sides.

[0011] The third section of the concrete tower column is equipped with embedded parts and an operating platform. The operating platform is located below the embedded parts and is equipped with brackets. The brackets are connected to the embedded parts. A jack is installed on one side of the bracket. The jack is horizontally positioned to push the concrete tower column on that side. The active cross brace is installed on a pair of brackets, with one end connected to the embedded parts of the concrete tower column and the other end connected to the jack.

[0012] Preferably, in step S2, the two steel supports of the same steel-concrete composite section are connected by a horizontal connection, the top surface of the steel support has a stepped structure, and the three-way jack is set on the lower step of the top surface of the steel support.

[0013] Preferably, the double-layer cross bracing in step S4 includes: an upper horizontal bracing, a lower horizontal bracing, and diagonal bracing; several spaced upper horizontal bracings are connected into a whole by horizontal bracing, several spaced lower horizontal bracings are connected into a whole by horizontal bracing, and the upper and lower horizontal bracings are connected by several diagonal bracings.

[0014] Both ends of the upper and lower horizontal supports are provided with ear plates with bolt holes. The upper part of the steel-concrete composite section of the two tower legs and the upper part of ST1 and ST2 are all equipped with brackets. The brackets are equipped with pin boxes. The upper and lower horizontal supports are connected and fixed with the corresponding pins and opposite sides by pins.

[0015] Preferably, the matching and alignment device in step S5 includes a horizontal circumferential seam matching and alignment device and a vertical seam matching and alignment device.

[0016] Before hoisting, the horizontal circumferential joint matching and alignment device is installed on the corresponding upper and lower steel tower segments. The horizontal circumferential joint matching and alignment device includes an upper alignment component and a lower alignment component. A punch is driven between the upper and lower alignment components for positioning. If the upper and lower alignment components need to be leveled, steel plates of different thicknesses are used as shims to achieve elevation positioning.

[0017] The vertical weld matching and alignment device is installed on the steel tower segments of the left and right tower legs that need to be joined before hoisting. The vertical weld matching and alignment device includes a left alignment component and a right alignment component. The left and right alignment components are positioned by driving punch pins between them. If the left and right alignment components need to be leveled, steel plates of different thicknesses and / or welding widths are used to adjust the overall shape of the steel tower.

[0018] Preferably, step S5 further includes:

[0019] By continuously and accurately measuring various attitude parameters of the segment during the nighttime temperature period, and combining the measured plane and elevation parameters of segments ST2 and ST3 with the manufacturing parameters of segment ST4, the installation parameters of segment ST4 are determined through simulation calculations, and the thickness of the shim steel plate between the matching and alignment devices is determined. The overall alignment of the steel tower is adjusted by shimming steel plates of corresponding thickness and welding width on the matching and alignment devices.

[0020] The present invention has at least the following beneficial effects: it adopts a construction method that simultaneously achieves precise positioning and closure of steel tower segments, uses three-way jacks to make the initial segment steel tower column more accurately positioned, and installs double-layer cross bracing to improve the installation accuracy of the steel tower column closure, thus ensuring the overall alignment of the tower column.

[0021] Other advantages, objectives and features of the present invention will become apparent in part from the following description, and in part from those skilled in the art through study and practice of the invention. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the overall structure of the tower column of the present invention;

[0023] Figure 2 This is a schematic diagram of the main structure and installation position of the horizontal cross brace of the present invention;

[0024] Figure 3 This is a schematic diagram of the installation of the three-way jack and steel support of the present invention;

[0025] Figure 4 This is a schematic diagram of the connection of the double-layer cross brace of the present invention;

[0026] Figure 5 This is a bottom view of the schematic diagram of the double-layer cross bracing of the present invention;

[0027] Figure 6 This is a front view of the horizontal circumferential seam matching and alignment device of the present invention;

[0028] Figure 7 This is a side view of the horizontal circumferential seam matching and alignment device of the present invention;

[0029] Figure 8 This is a top view of the horizontal circumferential seam matching and alignment device of the present invention;

[0030] Figure 9 This is a front view of the vertical seam matching and alignment device of the present invention.

[0031] Explanation of reference numerals in the attached drawings: 1 First steel pipe, 2 Second steel pipe, 3 Embedded part, 4 Operating platform, 5 Corbel, 6 Concrete tower column, 7 Steel-concrete composite section, 8 Steel tower column, 9 Jack, 10 Steel support, 11 Three-way jack, 12 Horizontal brace, 13 Upper horizontal brace, 14 Lower horizontal brace, 15 Diagonal brace, 16 Ear plate, 17 Steel pin, 18 Upper alignment component, 19 Lower alignment component, 20 Matching alignment device, 21 Left alignment component, 22 Right alignment component. Detailed Implementation

[0032] The present invention will now be described in detail and completely with reference to the accompanying drawings. Those skilled in the art will be able to implement the present invention based on these descriptions. Before describing the present invention with reference to the accompanying drawings, it should be particularly noted that the technical solutions and features provided in various parts of the present invention, including the following description, can be combined with each other without conflict.

[0033] Furthermore, the embodiments of the present invention described below are generally only some, not all, of the embodiments of the present invention. Therefore, all other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort should fall within the scope of protection of the present invention.

[0034] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. The specific implementation process is as follows:

[0035] like Figure 1 As shown, the entire tower column is composed of several concrete tower columns 6, steel-concrete composite sections 7, and several steel tower columns 8 from bottom to top. This application mainly focuses on the closure of the steel tower column 8 section, and provides a construction method for achieving precise positioning and closure of steel tower segments in a high tower column, characterized by the following steps:

[0036] S1, such as Figure 2 As shown, an active cross brace is installed at the top third concrete tower column 6 to adjust the deviation that occurs during the construction of the concrete tower column 6 and reduce the installation error of the steel tower column 8.

[0037] S2, such as Figure 3As shown, four stepped steel supports 10 are installed on the steel-concrete composite section 7 of the left and right tower legs. The steel supports 10 are installed in pairs on the corresponding steel-concrete composite section 7. A 150t three-way jack 11 is placed on each steel support 10, which can slowly lift the starting segment steel tower column 8. The starting segment steel tower column 8 is named ST1. The starting segment steel tower column 8 is precisely adjusted by the three-way jack 11. If the elevation is not met, steel plates can be placed on the steel support 10.

[0038] S3. After the initial section of the steel tower of a single tower leg is adjusted, the pre-reserved limiting steel on the bearing plate is initially welded to the steel support 10 on the transverse passage platform at the top of the steel support 10. After the measurement and verification meet the requirements, the four limiting steels are then welded firmly. The welds must meet the requirements of the drawings.

[0039] S4, such as Figures 4-5 As shown, the second segment of the steel tower column 8 is named ST2, and so on. When installing ST2, the double-layer cross bracing is installed simultaneously. First, the temporarily locked ST1 is connected to the double-layer cross bracing with pins, and then ST2 is adjusted to ensure that the pins can be inserted. It should be noted that ST2 refers to the same height as ST1, which is installed on the steel-concrete composite section 7 on the other side of the tower leg. The double-layer cross bracing determines the size and pin opening position when the steel tower column 8 is pre-assembled. It has a positioning function during the installation of the steel tower column 8, and at the same time ensures the accuracy of the relative position, ensuring the smooth closure of the next segment of the steel tower column 8.

[0040] S5. The matching and alignment device 20 is pre-assembled in the factory to ensure that the hole position and size shape meet the usage requirements. The matching and alignment device 20 that meets the requirements is transported to the construction site and installed at the corresponding steel tower position before hoisting. The horizontal circumferential joint and vertical weld of the steel tower are aligned to realize the installation of the steel tower and the adjustment of its alignment.

[0041] Based on the traditional construction method of using traction ropes for positioning, this project proposes a construction method employing active horizontal bracing, three-phase jacks 9, limiting steel, double-layer cross bracing, and horizontal and vertical alignment devices 20. The key feature of this method is the installation of active horizontal bracing at the top third section of the concrete tower column 6 to adjust for any misalignment during construction, thus reducing installation errors in the steel tower column 8. The initial section of the steel tower column 8 is precisely positioned using a tower crane placed on four 150t three-phase jacks 11, and then temporarily secured using limiting steel. Double-layer cross bracing ensures the relative position of the two closure steel tower columns 8. Subsequent sections are then accurately installed using the horizontal and vertical alignment devices 20, preventing errors during the construction of the steel tower column 8. To address the challenges of precise positioning during the installation of the ultra-high steel tower column 8 and its post-closure, this project employs a construction method that achieves precise positioning and closure of the steel tower segments through technological innovation. This tooling eliminates the need for positioning via traction ropes, utilizing three-way jacks 11 for precise positioning, greatly increasing the installation accuracy of the ultra-high steel tower column 8 and the control of its overall alignment.

[0042] This technical solution may also include the following technical details to better achieve the technical effect: the active cross brace includes a first steel pipe 1 and a second steel pipe 2, and several first steel pipes 1 arranged at intervals are connected into a whole by the second steel pipes 2, and the two ends of the first steel pipe 1 are opposite to the third concrete tower column 6 on both sides.

[0043] The third concrete tower column 6 is equipped with embedded parts 3 and an operating platform 4. The operating platform 4 is located below the embedded parts 3 and has brackets 5 connected to the embedded parts 3. One of the brackets 5 has a jack 9 installed on one side, which is used to push the concrete tower column 6 on that side. The active cross brace is installed on a pair of brackets 5, with one end connected to the embedded parts 3 of the concrete tower column 6 and the other end connected to the jack 9. The active cross brace and jack 9 are used to correct the errors of the left and right tower legs of the concrete tower column 6. The active cross brace also serves as a temporary locking mechanism, providing favorable conditions for the subsequent closure of the steel tower column 8.

[0044] This technical solution may also include the following technical details to better achieve the technical effect: In step S2, the two steel supports 10 of the same steel-concrete composite section 7 are connected by a horizontal connector 12. The top surface of the steel support 10 has a stepped structure, and the three-way jack 11 is set on the lower step of the top surface of the steel support 10. The steel support 10 and the steel-concrete composite section 7 are fixed by pre-embedded anchor bars on the steel-concrete composite section 7.

[0045] This technical solution may also include the following technical details to better achieve the technical effect: the double-layer cross bracing in step S4 includes: upper horizontal bracing 13, lower horizontal bracing 14 and diagonal bracing 15; several spaced upper horizontal bracing 13 are connected into a whole by horizontal bracing 12, several spaced lower horizontal bracing 14 are connected into a whole by horizontal bracing 12, and the upper horizontal bracing 13 and the lower horizontal bracing 14 are connected by several diagonal bracing 15, which have a wavy line structure.

[0046] Both ends of the upper horizontal brace 13 and the lower horizontal brace 14 are provided with ear plates 16 with bolt holes. The upper part of the steel-concrete composite section 7 of the two tower legs and the upper part of ST1 and ST2 are all equipped with brackets 5. The brackets 5 are equipped with pin boxes. The upper horizontal brace 13 and the lower horizontal brace 14 are connected and fixed with the corresponding pins and opposite steel pins 17.

[0047] This technical solution may also include the following technical details to better achieve the technical effect: such as Figures 6-9 As shown, the matching and alignment device 20 in step S5 includes a horizontal circumferential seam matching and alignment device 20 and a vertical seam matching and alignment device 20.

[0048] Before hoisting, the horizontal circumferential joint matching and alignment device 20 is installed on the corresponding upper and lower steel tower segments. The horizontal circumferential joint matching and alignment device 20 includes an upper alignment component 18 and a lower alignment component 19. Horizontal precision positioning is achieved by driving punches / bolts between the upper and lower alignment components 19. If the upper alignment component 18 and the lower alignment component 19 need to be leveled, steel plates of different thicknesses are used to achieve elevation positioning.

[0049] The vertical weld matching and alignment device 20 is installed on the steel tower segments of the left and right tower legs that need to be joined before hoisting. The vertical weld matching and alignment device 20 includes a left alignment member 21 and a right alignment member 22. Precise positioning is achieved by driving punches between the left and right alignment members 22. If the left alignment member 21 and the right alignment member 22 need to be leveled, steel plates of different thicknesses and / or welding widths are used to adjust the overall shape of the steel tower.

[0050] This technical solution may also include the following technical details to better achieve the technical effect: Step S5 further includes:

[0051] By continuously and accurately measuring various attitude parameters of the segment during the nighttime temperature period, and combining the measured plane and elevation parameters of segments ST2 and ST3 with the manufacturing parameters of segment ST4, the installation parameters of segment ST4 are determined through simulation calculations, and the thickness of the shim steel plate between the matching alignment device 20 is determined. The overall alignment of the steel tower is adjusted by shimming the steel plate of the corresponding thickness and the welding width on the matching alignment device 20.

[0052] The construction method described in this application has been successfully applied to the Ma'anshan Yangtze River Bridge, a dual-purpose road-rail bridge for the Chaohu-Ma'anshan Intercity Railway. This construction method not only improved the installation accuracy when the steel towers were closed, but also met the requirements for overall shape control of the tower columns during construction.

[0053] Although embodiments of the present invention have been disclosed above, they are not limited to the applications listed in the specification and embodiments. They can be applied to various fields suitable for the present invention. For those skilled in the art, other modifications can be easily made. Therefore, without departing from the general concept defined by the claims and their equivalents, the present invention is not limited to the specific details and embodiments shown and described herein.

Claims

1. A construction method for achieving precise positioning and closure of steel tower segments in high-rise buildings, characterized in that, Includes the following steps: S1. Install active cross bracing at the top third section of the concrete tower column to adjust for any deviation that occurs during the construction of the concrete tower column. S2. Four stepped steel supports are installed on the steel-concrete composite sections of the left and right tower legs. The steel supports are installed in pairs on the corresponding steel-concrete composite sections. Three-way jacks are placed on each steel support to lift the starting segment steel tower column. The starting segment steel tower column is named ST1. The starting segment steel tower column is precisely adjusted by the three-way jacks. If the elevation is not met, steel plates can be placed on the steel supports. S3. After the initial section of the steel tower of a single tower leg is adjusted, the limiting steel reserved on the bearing plate of the transverse passage platform at the top of the steel support is initially welded to the steel support. After the measurement and verification meet the requirements, the four limiting steels are then welded firmly, and the welds must meet the requirements of the drawings. S4. The second section of the steel tower column is named ST2, and so on. When installing ST2, the double-layer cross bracing is installed simultaneously. First, the temporarily locked ST1 is connected to the double-layer cross bracing with pins. Then, ST2 is adjusted so that the pin box of the upper bracket of ST2 is aligned with the bolt hole on the ear plate of the double-layer cross bracing, and the pin is inserted to connect and fix it. The double-layer cross bracing in step S4 includes: an upper horizontal bracing, a lower horizontal bracing, and diagonal bracing; several spaced upper horizontal bracings are connected into a whole by horizontal bracing, several spaced lower horizontal bracings are connected into a whole by horizontal bracing, and the upper and lower horizontal bracings are connected by several diagonal bracings. Both ends of the upper and lower horizontal supports are provided with ear plates with bolt holes. The upper part of the steel-concrete composite section of the two tower legs and the upper part of ST1 and ST2 are all equipped with brackets. The brackets are equipped with pin boxes. The ear plates at both ends of the upper and lower horizontal supports are connected and fixed to the pin boxes on the brackets on the upper part of the corresponding steel-concrete composite section, ST1 and ST2 by pins. S5. The matching and alignment device is transported to the construction site and installed at the corresponding steel tower position before hoisting to align the horizontal circumferential joints and vertical welds of the steel tower, thereby realizing the installation and alignment adjustment of the steel tower.

2. The construction method for achieving precise positioning and closure of high-tower steel tower segments as described in claim 1, characterized in that, The active cross bracing includes a first steel pipe and a second steel pipe. Several first steel pipes arranged at intervals are connected into a whole by the second steel pipes. The two ends of the first steel pipes are opposite to the third concrete tower column on both sides. The third section of the concrete tower column is equipped with embedded parts and an operating platform. The operating platform is located below the embedded parts and is equipped with brackets. The brackets are connected to the embedded parts. A jack is installed on one side of the bracket. The jack is horizontally positioned to push the concrete tower column on that side. The active cross brace is installed on a pair of brackets, with one end connected to the embedded parts of the concrete tower column and the other end connected to the jack.

3. The construction method for achieving precise positioning and closure of high-tower steel tower segments as described in claim 1, characterized in that, In step S2, the two steel supports of the same steel-concrete composite section are connected by a horizontal connection. The top surface of the steel support is a stepped structure, and the three-way jack is set on the lower step of the top surface of the steel support.

4. The construction method for achieving precise positioning and closure of high-tower steel tower segments as described in claim 1, characterized in that, The matching and alignment device in step S5 includes a horizontal circumferential seam matching and alignment device and a vertical seam matching and alignment device. Before hoisting, the horizontal circumferential joint matching and alignment device is installed on the corresponding upper and lower steel tower segments. The horizontal circumferential joint matching and alignment device includes an upper alignment component and a lower alignment component. A punch is driven between the upper and lower alignment components for positioning. If the upper and lower alignment components need to be leveled, steel plates of different thicknesses are used as shims to achieve elevation positioning. The vertical weld matching and alignment device is installed on the steel tower segments of the left and right tower legs that need to be joined before hoisting. The vertical weld matching and alignment device includes a left alignment component and a right alignment component. The left and right alignment components are positioned by driving punch pins between them. If the left and right alignment components need to be leveled, steel plates of different thicknesses and / or welding widths are used to adjust the overall shape of the steel tower.

5. The construction method for achieving precise positioning and closure of high-tower steel tower segments as described in claim 4, characterized in that, Step S5 further includes: By continuously and accurately measuring the attitude parameters of the installed ST2 and ST3 segments during the nighttime temperature period, and combining the measured plane and elevation parameters of the ST2 and ST3 segments with the manufacturing parameters of the ST4 segment, the installation parameters of the ST4 segment are determined through simulation calculations, and the thickness of the shim steel plate between the matching and alignment devices is determined. The overall alignment of the steel tower is adjusted by shimming the steel plate of the corresponding thickness and welding width on the matching and alignment devices.

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