Secondary pre-assembling jig frame of steel inclined tower and spatial posture adjusting method

Abstract

This invention relates to the field of steel inclined tower construction technology, specifically to a secondary pre-assembly jig and spatial attitude adjustment method for steel inclined towers. The spatial attitude adjustment method includes: obtaining the tilt direction and tilt angle of a large segment based on the theoretical data of the completed bridge alignment; calculating the theoretical length of the lifting equipment based on the position of the connection point between the lifting equipment and the large segment; assembling the jig according to the tilt direction and tilt angle of the large segment to be installed; assembling multiple small segments on the jig to form the large segment; using the lifting equipment to lift the large segment off the jig, measuring the tilt direction and tilt angle of the large segment; if the tilt direction and tilt angle of the large segment deviate from the theoretical data, adjusting the lifting equipment until the tilt direction and tilt angle of the large segment are consistent with the theory; and hoisting the large segment to the top of the tower and welding it. This invention, by adjusting the large segment twice, ensures that the spatial attitude of the large segment is consistent with the theory, greatly facilitating subsequent aerial installation.

Description

Technical Field

[0001] This invention relates to the field of steel inclined tower construction technology, specifically to a secondary pre-assembly jig for steel inclined towers and a method for adjusting the spatial posture. Background Technology

[0002] Conventional cable-stayed towers are all straight towers, which are relatively convenient for pre-assembly, hoisting, installation, and repositioning. They can be transported to the bridge site for direct hoisting and installation after horizontal (or vertical) matching in the factory. Hoisting, installation, repositioning, and connection with already installed segments can all be carried out quickly. However, the construction of torsional inclined steel towers is more complex. Conventional small segment installation can lead to cumulative errors, making alignment control extremely difficult, especially for spatial torsional steel inclined towers. Summary of the Invention

[0003] The purpose of this invention is to address the shortcomings of existing technologies by providing a secondary pre-assembly jig and spatial attitude adjustment method for steel inclined towers. By pre-assembling small segments on the jig, the large segments can complete the initial attitude adjustment on the jig. Subsequently, the large segments can be precisely adjusted using lifting equipment to ensure that the spatial attitude of the large segments is consistent with the theory, which greatly facilitates subsequent aerial installation.

[0004] To address the aforementioned technical problems, in a first aspect, the present invention provides a method for adjusting the spatial attitude of a steel inclined tower, comprising:

[0005] Based on the theoretical data of the completed bridge alignment, the inclination direction and inclination angle of the large segments are obtained, and the theoretical length of the lifting equipment is calculated based on the position of the connection point between the lifting equipment and the large segments.

[0006] Assemble the jig according to the tilt direction and tilt angle of the large segment to be installed;

[0007] Multiple small segments are assembled on a frame to form the large segment;

[0008] Use a lifting device to lift the large segment off the jig, measure the tilt direction and tilt angle of the large segment. If the tilt direction and tilt angle of the large segment deviate from the theoretical data, adjust the lifting device until the tilt direction and tilt angle of the large segment are consistent with the theory.

[0009] Large sections are hoisted to the top of the tower and then welded.

[0010] In some embodiments, the method of adjusting the lifting device until the tilt direction and tilt angle of the large segment are consistent with the theory includes: the lifting device includes multiple sets of hydraulic cylinders and lifting ropes; the length of each lifting device is calculated; for lifting devices whose length is not equal to the theoretical length, the hydraulic cylinders are adjusted to make their length equal to the theoretical length; the tilt direction and tilt angle of the large segment are measured again; if there is still a deviation, the length of one or more hydraulic cylinders is finely adjusted according to the deviation of the tilt direction and tilt angle of the large segment from the theoretical data, so that the tilt direction and tilt angle of the large segment are consistent with the theory.

[0011] In some embodiments, the assembly method of the jig includes: welding one end of a plurality of main beam units together so that the other end of the plurality of main beam units extends outward radially; connecting the two ends of the connecting beam to two adjacent main beam units, thereby connecting all the main beam units into one unit; calculating the height of each pad according to the tilt direction and tilt angle of the large segment to be installed and the fixed position of each pad on the main beam; and installing each pad on the main beam to complete the assembly of the jig.

[0012] In some embodiments, the method of assembling multiple segments on a jig includes:

[0013] The large segment includes n small segments. The first small segment is hoisted onto the jig and fixed firmly. Then the second small segment is hoisted. After the first and second small segments are matched and aligned, the circumferential weld is welded. The same method is used to hoist and weld the subsequent small segments.

[0014] In some embodiments, before using a lifting device to lift a large segment off the jig, the tilt direction and tilt angle of the large segment are measured. If the difference between the measured value and the theoretical value is within a preset range, the large segment is then lifted off the jig.

[0015] In some embodiments, after the large segment is lifted a certain distance away from the jig using a lifting device, it is held for a period of time before the tilt direction and tilt angle of the large segment are measured.

[0016] Secondly, the present invention provides a secondary pre-assembly jig for a steel inclined tower, comprising a jig, the jig including a base frame and a plurality of pads, the plurality of pads being vertically arranged on the base frame, the height of the plurality of pads being determined according to the theoretical tilt direction and theoretical tilt angle of the large segment to be installed, such that the tilt direction and tilt angle of the large segment to be installed after being assembled on the jig are equal to the theoretical tilt direction and theoretical tilt angle, respectively.

[0017] In some embodiments, the base frame includes a main beam and a connecting beam. The main beam includes a plurality of main beam units, one end of which is fixedly connected and the other end of which extends outward in a radial pattern. The connecting beam is used to connect the plurality of main beam units.

[0018] In some embodiments, the pad is fixedly mounted on the main beam.

[0019] In some embodiments, the included angle between any two adjacent main beam elements is equal.

[0020] In some embodiments, the pad is detachably connected to the main beam.

[0021] The beneficial effects of this invention are as follows:

[0022] 1. This invention involves secondary pre-assembly of small segments on a jig, allowing for initial posture adjustment of larger segments on the jig. Subsequent precise adjustments to the larger segments using lifting equipment ensure their spatial posture matches the theoretical requirements, greatly facilitating subsequent aerial installation. This solves transportation issues and reduces the risks of high-altitude operations. After simple alignment of the larger segments with the tower top in the air, welding can proceed, and ground construction is extremely convenient. This significantly reduces the difficulty of procedures such as segment matching and alignment, alignment adjustment, measurement verification, welding connection, and monitoring. Furthermore, multiple jigs can be set up on the ground for simultaneous pre-assembly, transforming a single aerial work surface into multiple ground work surfaces, greatly improving installation efficiency and reducing installation time.

[0023] 2. When adjusting the tilt direction and tilt angle of a large segment using the lifting tools, the length of each lifting tool can be adjusted first to make it equal to the theoretical length of the lifting tool. If the requirements are still not met, the lifting tools can be fine-tuned so that the tilt direction and tilt angle of the large segment are consistent with the theory.

[0024] 3. This invention solves the problem of inconvenient transportation of large segments by decomposing large segments into multiple smaller segments and assembling them on a jig. Attached Figure Description

[0025] Figure 1 This is a top view of the tire frame of the present invention;

[0026] Figure 2 This is a schematic diagram of the structure of the present invention when the large segments are installed on the frame;

[0027] Figure 3 This is a schematic diagram of the structure during the hoisting of large sections of the present invention.

[0028] Attached reference numerals: Main beam 1; Outer ring connecting beam 2; Inner ring connecting beam 3; Pad 4; Jig 5; First segment 6; Second segment 7; Third segment 8; Large segment 9; Hydraulic cylinder 10; Lifting rope 11. Detailed Implementation

[0029] To make the technical problems, technical solutions, and beneficial effects to be solved by this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and are not intended to limit the scope of this application.

[0030] like Figure 1 As shown, the present invention provides a secondary pre-assembly jig for a steel inclined tower, including a jig 5. The jig 5 includes a base frame and multiple pads 4. The multiple pads 4 are vertically arranged on the base frame. The height of the multiple pads 4 is determined according to the theoretical tilt direction and theoretical tilt angle of the large segment 9 to be installed, so that the tilt direction and tilt angle of the large segment 9 to be installed after being assembled on the jig 5 are equal to the theoretical tilt direction and theoretical tilt angle, respectively.

[0031] The jig 5, by setting up multiple support pads 4, ensures that the spatial posture of the large segment 9, after assembly on the jig 5, is the same as or very close to the theoretical spatial posture. This allows for the initial adjustment of the spatial posture (tilt direction and tilt angle) of the large segment 9. Furthermore, since the jig 5 is on the ground, ground construction is extremely convenient, greatly reducing the construction difficulty of processes such as segment matching and alignment, alignment adjustment, measurement verification, welding connection, and monitoring. Multiple jigs 5 on the ground can also be used for pre-assembly work simultaneously, transforming a single working surface in the air into multiple working surfaces on the ground, significantly improving installation efficiency and reducing installation time.

[0032] In some embodiments, the base frame includes a main beam 1 and connecting beams. The main beam 1 includes multiple main beam units, one end of which is fixedly connected, and the other end of which extends radially outward. The connecting beams are used to connect the multiple main beam units. Figure 1 As shown, the connecting beams include outer connecting beam 2 and inner connecting beam 3. Multiple main beam units are arranged radially and connected by connecting beams, ensuring the stability of the base frame and preventing excessive deviation between the spatial posture of the large segment 9 after assembly on the jig 5 and the theoretical spatial posture.

[0033] The main beams are H500x300x12x16, and the connecting beams are HW150x150x7x10.

[0034] Depending on the installation height, the tilt angle of the large sections on the jig 5 can reach up to 50 degrees. The ground on which the jig 5 is placed has been hardened and concrete has been poured. The jig 5 has a large structural weight and area, resulting in good stability. Moreover, the jig 5 only bears vertically downward or obliquely downward forces, and the jig 5 generally will not shift.

[0035] In some embodiments, the pad 4 is fixedly mounted on the main beam 1.

[0036] In some embodiments, the included angle between any two adjacent main beam elements is equal.

[0037] In some embodiments, the pad 4 is detachably connected to the main beam 1, so that both the pad 4 and the base frame can be reused. The pad 4 and the main beam 1 can be connected by bolts.

[0038] In some embodiments, the pad 4 can be made of steel plate, steel section, steel pipe or jack. When a jack is used, the spatial posture of the large segment 9 on the jig frame 5 can be adjusted in real time.

[0039] This invention provides a method for adjusting the spatial attitude of a steel inclined tower, comprising:

[0040] Based on the theoretical data of the completed bridge alignment, the tilt direction and tilt angle of the large segment 9 are obtained, and the theoretical length of the lifting device is calculated based on the position of the connection point between the lifting device and the large segment 9.

[0041] Assemble the jig 5 according to the tilt direction and tilt angle of the large segment 9 to be installed;

[0042] like Figure 2 As shown, multiple small segments are assembled on the frame 5 to form a large segment 9;

[0043] like Figure 3 As shown, the large section 9 is lifted off the jig 5 using a lifting device, and the tilt direction and tilt angle of the large section 9 are measured. If the tilt direction and tilt angle of the large section 9 deviate from the theoretical data, the lifting device is adjusted until the tilt direction and tilt angle of the large section 9 are consistent with the theory.

[0044] The large section 9 was hoisted to the top of the tower and welded.

[0045] This invention involves pre-assembling smaller segments on a jig 5, allowing the larger segment 9 to undergo initial posture adjustment on the jig 5. Subsequent precise adjustments to the larger segment 9 using lifting equipment ensure its spatial posture matches the theoretical requirements, greatly facilitating subsequent aerial installation. This solves transportation issues and reduces the risks of high-altitude operations. After simple alignment of the larger segment 9 with the tower top, welding can proceed, and ground construction is extremely convenient. This significantly reduces the difficulty of segment matching, alignment adjustment, measurement verification, welding connection, and monitoring. Furthermore, multiple jigs 5 can be set up on the ground for simultaneous pre-assembly, transforming a single aerial work surface into multiple ground work surfaces, greatly improving installation efficiency and reducing installation time.

[0046] In some embodiments, the method of adjusting the lifting device until the tilt direction and tilt angle of the large segment 9 are consistent with the theory includes: the lifting device includes multiple sets of hydraulic cylinders 10 and lifting ropes 11, each set includes two lifting ropes 11 and one hydraulic cylinder 10, the two lifting ropes 11 are respectively connected to the cylinder body and piston rod of the hydraulic cylinder 10, the length of each lifting device is calculated, for the lifting device that is not equal to the theoretical length, its hydraulic cylinder 10 is adjusted so that its length is equal to the theoretical length, the tilt direction and tilt angle of the large segment 9 are measured again, if there is still a deviation, then according to the deviation of the tilt direction and tilt angle of the large segment 9 from the theoretical data, the length of one or more hydraulic cylinders 10 is finely adjusted so that the tilt direction and tilt angle of the large segment 9 are consistent with the theory.

[0047] It should be noted that, under normal circumstances, when the large section 9 is lifted using a lifting device, its tilt direction and angle should be consistent with the theory. However, due to errors in the jig 5 (i.e., the height error of the pad 4 and the levelness error of the base frame) and the length error of the lifting device, the tilt direction and angle of the large section 9 may not be consistent with the theory. In this case, it is advisable to first check whether the length of the lifting device is equal to its theoretical length. The length of the lifting device = the total length of the hydraulic cylinder 10 + the total length of the lifting rope 11. When the length of each lifting device is equal to the theoretical length, the tilt direction and angle of the large section 9 will be consistent with the theory. The tilt direction and tilt angle of the large section 9 should be consistent. If the length of each lifting tool is equal to the theoretical length, but the tilt direction and tilt angle are inconsistent with the theory, it may be due to a change in the extension length of the hydraulic cylinder 10 after the large section 9 is lifted by the lifting tool or an error in the length of the lifting rope 11. In this case, the tilt direction and tilt angle of the large section 9 deviate slightly from the theory. The length of one or more hydraulic cylinders 10 can be directly fine-tuned to make the tilt direction and tilt angle of the large section 9 consistent with the theory, which facilitates the quick alignment and connection of the large section 9 with the top of the installed tilted steel tower after it is lifted.

[0048] In some embodiments, the assembly method of the jig 5 includes: welding one end of a plurality of main beam units together so that the other end of the plurality of main beam units extends outward radially; connecting the two ends of the connecting beam to two adjacent main beam units, thereby connecting all the main beam units into one unit; calculating the height of each pad 4 according to the tilt direction and tilt angle of the large segment 9 to be installed and the fixed position of each pad 4 on the main beam 1; and installing each pad 4 on the main beam 1 to complete the assembly of the jig 5.

[0049] In some embodiments, the method of assembling multiple segments on the jig 5 includes:

[0050] The large segment 9 includes n smaller segments. The first smaller segment is hoisted onto the jig 5 and fixed securely. Then the second smaller segment is hoisted. After the first and second smaller segments are matched and aligned, the circumferential weld is welded. The same method is used to hoist and weld the subsequent smaller segments.

[0051] The small segments are assembled into large segments 9 on the jig 5 and then installed on the top of the tower, which reduces the risk of high-altitude operations and makes ground construction extremely convenient. This greatly reduces the construction difficulty of processes such as segment matching and alignment, alignment adjustment, measurement verification, welding connection, and monitoring.

[0052] Figure 2 The diagram illustrates the situation of three segments. The large segment 9 includes the first segment 6, the second segment 7, and the third segment 8. Before hoisting the second segment 7, the spatial attitude of the first segment 6 can be measured. If the difference between its spatial attitude and the theoretical spatial attitude is within the preset difference range, the second segment 7 can be assembled directly. Otherwise, the height of the lifting pad 4 is adjusted (when the lifting pad 4 is a jack, the lifting height of the jack can be adjusted directly) until the difference between the spatial attitude of the first segment 6 and the theoretical spatial attitude is within the preset difference range.

[0053] In addition, since the route from the steel tower manufacturing site to the bridge site is via rural roads, the steel towers are manufactured in small segments of 2-4m in height at the factory. These segments are then transported to the bridge site via rural roads and finally vertically matched and connected on-site to form large segments of 10-12m, thus solving the transportation problem.

[0054] In some embodiments, before using a lifting device to lift the large segment 9 off the frame 5, the tilt direction and tilt angle of the large segment 9 are measured. If the difference between the measured value and the theoretical value is within a preset range, the large segment 9 is then lifted off the frame 5.

[0055] Since the jig 5 may move or rotate during the assembly of the large segment 9, causing significant changes in the tilt direction and tilt angle of the large segment 9, the tilt direction and tilt angle of the large segment 9 should be checked before it is lifted off the jig 5.

[0056] In some embodiments, after the large segment 9 is lifted a certain distance away from the frame 5 using a lifting device, the tilt direction and tilt angle of the large segment 9 are measured after maintaining the position for a period of time.

[0057] The large segment 9 can be lifted 10-20cm above the jig 5 and held for 5-10 minutes to allow it to stabilize before measuring its spatial attitude. This ensures the accuracy of the measurement results. If the spatial attitude of the large segment 9 differs significantly from the theoretical spatial attitude, the large segment 9 can be placed back onto the jig 5 and the lifting device can be inspected.

[0058] The above-described embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application, and should all be included within the protection scope of this application.

Claims

1. A method for adjusting the spatial attitude of a steel diagonal tower, characterized in that: include: Based on the theoretical data of the completed bridge alignment, the tilt direction and tilt angle of the large segment (9) are obtained, and the theoretical length of the lifting device is calculated based on the position of the connection point between the lifting device and the large segment (9). Assemble the jig (5) according to the tilt direction and tilt angle of the large segment (9) to be installed. Multiple small segments are assembled on the frame (5) to form the large segment (9). Use a lifting device to lift the large section (9) off the frame (5), measure the tilt direction and tilt angle of the large section (9), if the tilt direction and tilt angle of the large section (9) deviate from the theoretical data, adjust the lifting device until the tilt direction and tilt angle of the large section (9) are consistent with the theory. The large section (9) was hoisted to the top of the tower and welded; The method of adjusting the lifting device until the tilt direction and tilt angle of the large segment (9) are consistent with the theory includes: the lifting device includes multiple sets of hydraulic cylinders (10) and lifting ropes (11), calculate the length of each lifting device, for the lifting device that is not equal to the theoretical length, adjust its hydraulic cylinders (10) to make its length equal to the theoretical length, measure the tilt direction and tilt angle of the large segment (9) again, if there is still a deviation, then according to the deviation of the tilt direction and tilt angle of the large segment (9) from the theoretical data, fine adjust the length of one or more hydraulic cylinders (10) so that the tilt direction and tilt angle of the large segment (9) are consistent with the theory; The assembly method of the jig (5) includes: welding one end of multiple main beam units together so that the other end of multiple main beam units extends outward in a radial manner; connecting the two ends of the connecting beam with two adjacent main beam units, thereby connecting all main beam units into one; calculating the height of each pad (4) according to the tilt direction and tilt angle of the large segment (9) to be installed, and the fixed position of each pad (4) on the main beam (1); installing each pad (4) on the main beam (1) to complete the assembly of the jig (5).

2. The method of spatial attitude adjustment of a steel tower according to claim 1, characterized in that: Methods for assembling multiple small segments on a jig (5) include: The large segment (9) includes n small segments. The first small segment is hoisted onto the jig (5) and fixed firmly. Then the second small segment is hoisted. After the first and second small segments are matched and aligned, the circumferential weld is welded. The same method is used to hoist and weld the subsequent small segments.

3. The method of spatial attitude adjustment of a steel tower according to claim 1, characterized in that: Before using a lifting device to lift the large section (9) off the frame (5), the tilt direction and tilt angle of the large section (9) are measured. When the difference between the measurement and the theoretical value is within the preset difference range, the large section (9) is then lifted off the frame (5).

4. The method of spatial attitude adjustment of a steel tower according to claim 1, characterized in that: After using a lifting device to lift the large segment (9) a certain distance away from the frame (5), maintain it for a period of time and then measure the tilt direction and tilt angle of the large segment (9).

5. A secondary pre-assembly frame for a steel inclined tower used to implement the spatial attitude adjustment method for a steel inclined tower according to any one of claims 1 to 4, characterized in that: The system includes a frame (5), which includes a base frame and multiple pads (4). The multiple pads (4) are arranged vertically on the base frame. The height of the multiple pads (4) is determined according to the theoretical tilt direction and theoretical tilt angle of the large segment (9) to be installed, so that the tilt direction and tilt angle of the large segment (9) to be installed after being assembled on the frame (5) are equal to the theoretical tilt direction and theoretical tilt angle, respectively.

6. The secondary pre-erection jig for steel tower according to claim 5, characterized in that: The base frame includes a main beam (1) and a connecting beam. The main beam (1) includes multiple main beam units. One end of the multiple main beam units is fixedly connected, and the other end of the multiple main beam units extends outward in a radial pattern. The connecting beam is used to connect the multiple main beam units.

7. The secondary pre-erection jig for steel tower according to claim 6, characterized in that: The pad (4) is fixedly installed on the main beam (1).

8. The secondary pre-erection jig for steel tower according to claim 7, characterized in that: The pad (4) is detachably connected to the main beam (1).

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