Cable-stayed bridge steel tower less-bracket support structure and symmetrical construction method

Abstract

The present application discloses a cable-stayed bridge steel tower support structure with few supports and a symmetrical construction method, the cable-stayed bridge steel tower support structure with few supports includes: a lower support column, which is arranged inside the steel tower, the lower end of the lower support column is fixed on the base, and the upper end of the lower support column is fixedly connected to the cross beam segment in the steel tower; an upper support column, which is arranged inside the steel tower, the lower end of the upper support column is fixed on the cross beam segment in the steel tower, and the upper end is used to support the top segment of the steel tower; a transverse support, which is arranged inside the steel tower, and the two ends of the transverse support are respectively connected to the inner side of the adjacent steel tower segment. The present application achieves the technical effect of reducing the number of supports used and improving construction safety, thereby solving the problem in the related technology that the number of supports occupied during the construction process of the cable-stayed bridge steel tower is large, and there are great safety hazards.

Description

Technical Field

[0001] The present application relates to the technical field of bridge engineering construction, and in particular to a cable-stayed bridge steel tower with few brackets and a symmetrical construction method. Background Art

[0002] With the increasing number of cable-stayed bridge designs in recent years, steel towers have been widely used due to their light weight, few later defects, easy processing and beautiful appearance. In order to build a construction platform that meets the requirements of steel tower installation, the conventional method adopts the full-span scaffolding method and a single crawler crane hoisting construction process. The traditional full-span scaffolding is easy to construct and a crawler crane is set on one side, but it has the following disadvantages: (1) There are many brackets, which occupy a lot of space and pose a great safety hazard; (2) The scaffolding with a loop is generally required to be no longer than 24m, otherwise it needs to be designed and calculated separately; (3) The operating radius of a single crawler crane is too large, resulting in insufficient lifting capacity, affecting construction safety.

[0003] With regard to the problem in related technologies that a large number of supports are occupied during the construction process of steel towers of cable-stayed bridges, posing a great safety hazard, no effective solution has been proposed so far. Summary of the invention

[0004] The main purpose of the present application is to provide a cable-stayed bridge steel tower support structure with few brackets and a symmetrical construction method, so as to solve the problem in the related technology that the number of brackets occupied during the construction process of the cable-stayed bridge steel tower is large, which poses a great safety hazard.

[0005] In order to achieve the above-mentioned purpose, the present application provides a cable-stayed bridge steel tower with fewer supports, which includes: a lower support column, which is arranged on the inner side of the steel tower, the lower end of the lower support column is fixed on the base, and the upper end of the lower support column is fixedly connected to the cross beam segment in the steel tower; an upper support column, which is arranged on the inner side of the steel tower, the lower end of the upper support column is fixed on the cross beam segment in the steel tower, and the upper end is used to support the top segment of the steel tower; a transverse support, which is arranged on the inner side of the steel tower, and the two ends of the transverse support are respectively connected to the inner sides of adjacent steel tower segments.

[0006] Furthermore, the lower support columns are arranged in two rows, and each row of lower support columns is arranged in two rows;

[0007] The upper support columns are arranged in two rows, and each row of upper support columns is arranged with two.

[0008] Furthermore, the transverse supports are arranged in two groups and distributed front to back, and the upper support columns and the lower support columns are located between the two groups of transverse supports.

[0009] Furthermore, the first end of the transverse bracket is bolted to the corresponding steel tower segment, and the second end is abuttingly connected to the corresponding steel tower segment.

[0010] Furthermore, it also includes a transverse support member arranged on the inner side of the steel tower segment, and the second end of the transverse support is placed on the transverse support member.

[0011] Furthermore, it also includes a longitudinal support member arranged on the inner side of the steel tower segment, one side of the longitudinal support member is set as an inclined surface matching the inclination of the steel tower segment, and the other side is set as a vertical surface; the second end of the transverse bracket is connected to the vertical surface of the longitudinal support member.

[0012] Furthermore, a buffer is provided at the second end of the transverse support, and the second end of the transverse support is connected to the vertical surface of the longitudinal support through the buffer.

[0013] Furthermore, a first load-bearing beam is arranged at the upper end of the lower support column, a second load-bearing beam is arranged at the upper end of the upper support column, and a diagonal brace is arranged between the second load-bearing beam and the upper support column; a support assembly for supporting the top segment of the steel tower is arranged at the upper end of the second load-bearing beam, and the support assembly has an arc-shaped support surface.

[0014] Furthermore, it also includes an annular platform arranged on the steel tower segment and a transverse channel connecting the annular platform.

[0015] Furthermore, it also includes a ladder structure connecting the base and the cross beam segment in the steel tower, and connecting the cross beam segment in the steel tower and the top segment of the steel tower.

[0016] According to another aspect of the present application, a symmetrical construction method of a cable-stayed bridge steel tower with few supports is provided, using the above-mentioned cable-stayed bridge steel tower with few supports support structure, comprising the following steps:

[0017] The steel tower is divided into sections according to transportation conditions, hoisting adjustment and load conditions, and the diaphragms at both ends of each section are 0.5-1m away from the cutout. The sections include the left steel tower section, the right steel tower section, the steel tower middle beam section and the steel tower top section;

[0018] Fix the lower support columns on the base, and arrange the lower support columns in two rows, with two lower support columns in each row;

[0019] Two cranes are used to symmetrically hoist the left steel tower segment and the right steel tower segment at the same time, and the left steel tower segment and the right steel tower segment are welded and fixed in turn, and a transverse bracket is set up after the left steel tower segment and the right steel tower segment are welded and fixed, and the first end of the transverse bracket is fixed to the left steel tower segment, and the second end is fixed to the right steel tower segment;

[0020] After the left and right steel tower segments on both sides of the middle cross beam segment of the steel tower are hoisted and welded, the middle cross beam segment of the steel tower is hoisted and supported by the lower support columns, and the two sides of the middle cross beam segment of the steel tower are welded and fixed to the corresponding left and right steel tower segments;

[0021] An upper support column is fixed at the upper end of the cross beam segment in the steel tower, and the upper support columns are arranged in two rows, with two upper support columns in each row;

[0022] Two cranes are used to symmetrically lift the remaining left steel tower segments, right steel tower segments and steel tower top segments at the same time, and a transverse support is set up. The first end of the transverse support is fixed to the left steel tower segment, and the second end is fixed to the right steel tower segment. The steel tower top segment at the lowest end is supported by the upper support columns, and the remaining steel tower top segments are stacked and fixed in sequence.

[0023] Furthermore, the left steel tower segment and the right steel tower segment are provided with an annular platform before hoisting, and after the left steel tower segment and the right steel tower segment are welded and fixed, a transverse channel is provided between the two annular platforms for communication, and the transverse channel is supported by a transverse bracket;

[0024] Before hoisting, a transverse support and a longitudinal support are fixedly installed on the inner side of the left steel tower segment, and a bolting member is fixedly installed on the inner side of the right steel tower segment. When erecting a transverse support, a first end of the transverse support is bolted and fixed to the bolting member, and a second end is erected on the transverse support and contacts the longitudinal support;

[0025] A first set of ladder structures is arranged between the base and the cross beam section in the steel tower, and a second set of ladder structures is arranged between the cross beam section in the steel tower and the top section of the steel tower.

[0026] In the embodiment of the present application, a lower support column is set up, which is arranged on the inner side of the steel tower, and the lower end of the lower support column is fixed on the base, and the upper end of the lower support column is fixedly connected to the cross beam segment in the steel tower; an upper support column is set up on the inner side of the steel tower, and the lower end of the upper support column is fixed on the cross beam segment in the steel tower, and the upper end is used to support the top segment of the steel tower; a transverse support is set up on the inner side of the steel tower, and the two ends of the transverse support are respectively connected to the inner sides of adjacent steel tower segments, so as to achieve the purpose of using the lower support column on the inner side of the steel tower to support the cross beam segment in the steel tower, using the cross beam segment in the steel tower to bear the upper support column, and using the transverse support to laterally support the steel tower segment, thereby achieving the technical effect of reducing the number of supports used and improving construction safety, and further solving the problem of a large number of supports occupied during the construction process of the steel tower of the cable-stayed bridge in the related technology, which poses a great safety hazard. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The drawings constituting a part of this application are used to provide a further understanding of this application, so that other features, purposes and advantages of this application become more obvious. The schematic embodiment drawings and their descriptions of this application are used to explain this application and do not constitute an improper limitation on this application. In the drawings:

[0028] Figure 1 is a schematic diagram of the structure according to an embodiment of the present application;

[0029] Figure 2 It is a schematic diagram of the hoisting structure in an embodiment of the present application;

[0030] Figure 3 yes Figure 2 A schematic diagram of the enlarged structure of the local A in the middle;

[0031] Among them, 1 is the base, 2 is the steel tower segment, 3 is the annular platform, 4 is the transverse support, 5 is the transverse channel, 6 is the lower support column, 7 is the steel tower middle beam segment, 8 is the ladder structure, 9 is the steel tower top segment, 10 is the upper support column, 12 is the longitudinal support member, 13 is the buffer member, and 14 is the transverse support member. DETAILED DESCRIPTION

[0032] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present application.

[0033] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the numbers used in this way can be interchanged where appropriate, so as to describe the embodiments of the present application described herein.

[0034] In this application, the terms "upper", "lower", "inner", etc. indicate positions or positional relationships based on the positions or positional relationships shown in the drawings. These terms are mainly used to better describe the present application and its embodiments, and are not used to limit the indicated devices, elements or components to have a specific orientation, or to be constructed and operated in a specific orientation.

[0035] In addition, some of the above terms may be used to express other meanings in addition to indicating orientation or positional relationship. For example, the term "on" may also be used to express a certain dependency or connection relationship in some cases. For those of ordinary skill in the art, the specific meanings of these terms in this application can be understood according to specific circumstances.

[0036] In addition, the terms "disposed", "provided with", "connected", "fixed" and the like should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection, or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be an internal connection between two devices, elements or components. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0037] In addition, the term "plurality" shall mean two or more.

[0038] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0039] like Figure 1 As shown, an embodiment of the present application provides a cable-stayed bridge steel tower with fewer supports, which includes: a lower support column 6, which is arranged on the inner side of the steel tower, the lower end of the lower support column 6 is fixed on the base 1, and the upper end of the lower support column 6 is fixedly connected to the cross beam segment 7 in the steel tower; an upper support column 10, which is arranged on the inner side of the steel tower, the lower end of the upper support column 10 is fixed on the cross beam segment 7 in the steel tower, and the upper end is used to support the top segment 9 of the steel tower; a transverse support 4, which is arranged on the inner side of the steel tower, and the two ends of the transverse support 4 are respectively connected to the inner sides of adjacent steel tower segments 2.

[0040] In this embodiment, the hoisting bracket is arranged inside the main tower, and a steel pipe column is used on the ground foundation. The form of adding a parallel bracket connecting support is formed to form a base 1 structure, and the base 1 is a tower column base 1. The bracket columns are vertically connected by flanges, and the bracket columns include lower bracket columns 6 and upper bracket columns 10, wherein the lower bracket columns 6 are fixed on the base 1, and their length is equal to the height of the cross beam segment 7 in the steel tower from the base 1, so that the cross beam segment 7 in the steel tower can be supported by the lower bracket columns 6 after hoisting. The upper bracket columns 10 are installed on the cross beam segment 7 in the steel tower, and the upper bracket columns 10 are used to support the top segment 9 of the steel tower, and the upper bracket columns 10 and the top segment 9 of the steel tower are carried by the cross beam segment 7 in the steel tower, so as to realize the construction force of the upper structure. The lower bracket columns 6 are arranged in two rows, and each row of the lower bracket columns 6 is arranged in two rows; the upper bracket columns 10 are arranged in two rows, and each row of the upper bracket columns 10 is arranged in two rows, so that its structure is more stable. The two rows of upper support columns 10 and the two rows of lower support columns 6 are connected by cross braces to form a frame-shaped support structure.

[0041] The steel tower needs to be divided into multiple steel tower segments 2 before hoisting. After the hoisting and welding of some steel tower segments 2 on the left and right sides are completed, the transverse bracket 4 is installed on the inside of the steel tower, and the two ends of the transverse bracket 4 are respectively connected to the corresponding steel tower segments 2 to prevent the steel tower segments 2 from tipping over.

[0042] This embodiment achieves the purpose of using the lower support column 6 on the inner side of the steel tower to support the middle beam segment 7 of the steel tower, using the middle beam segment 7 of the steel tower to bear the upper support column 10, and using the transverse support 4 to laterally support the steel tower segment 2, thereby achieving the technical effect of reducing the number of supports used and improving construction safety, and further solving the problem in the related technology that a large number of supports are occupied during the construction process of the cable-stayed bridge steel tower, posing a major safety hazard.

[0043] Furthermore, the transverse supports 4 are arranged into two groups and distributed front to back, the upper support column 10 and the lower support column 6 are located between the two groups of transverse supports 4, so as to provide stable transverse support for each part of the steel tower segment 2, the first end of the transverse support 4 is bolted to the corresponding steel tower segment 2, and the second end is in abutment-connected with the corresponding steel tower segment 2.

[0044] Furthermore, it also includes a transverse support member 14 arranged on the inner side of the steel tower segment 2, and the second end of the transverse support member 4 is mounted on the transverse support member 14, and also includes a longitudinal support member 12 arranged on the inner side of the steel tower segment 2, one side of the longitudinal support member 12 is set as an inclined surface matching the inclination of the steel tower segment 2, and the other side is set as a vertical surface; the second end of the transverse support member 4 is connected to the vertical surface of the longitudinal support member 12.

[0045] In this embodiment, since the overall structure of the cable-stayed bridge steel tower is larger at the bottom and smaller at the top, both sides of each steel tower segment 2 are inclined surfaces. In order to facilitate the connection between the transverse bracket 4 and the inclined steel tower segment 2, a transverse support member 14 and a longitudinal support member 12 are installed on the inner side of the steel tower segment 2 that is not bolted to the transverse bracket 4. The vertical surface of the longitudinal support member 12 is in contact with the end surface of the transverse bracket 4, and the transverse support member 14 is used to support the transverse bracket 4, thereby providing stable support for the steel tower segment 2.

[0046] Furthermore, a buffer 13 is provided at the second end of the transverse support 4, and the second end of the transverse support 4 is connected to the vertical surface of the longitudinal support 12 through the buffer 13. The buffer 13 reduces the impact force generated between the transverse support 4 and the steel tower segment 2. The buffer 13 can be a rubber pad or other elastic member.

[0047] Furthermore, a first load-bearing beam is arranged at the upper end of the lower support column 6, a second load-bearing beam is arranged at the upper end of the upper support column 10, and a diagonal brace is arranged between the second load-bearing beam and the upper support column 10; a support assembly for supporting the top segment 9 of the steel tower is arranged at the upper end of the second load-bearing beam, and the support assembly has an arc-shaped support surface.

[0048] Furthermore, it also includes an annular platform 3 arranged on the steel tower segment 2 and a transverse channel 5 connecting the annular platform 3. The annular platform 3 is installed at the connection position of the steel tower segment 2 to form an operating platform. The platform is welded with steel sections and guardrails are arranged around it. The annular platforms 3 on the left and right sides are connected through the transverse channel 5 platform. The transverse channel 5 platform can be installed with the transverse bracket 4 as support, which is convenient for construction and personnel passage.

[0049] Furthermore, it also includes a ladder structure 8 connecting the base 1 and the middle cross beam segment 7 of the steel tower, and connecting the middle cross beam segment 7 of the steel tower and the top segment 9 of the steel tower. A full-length pedestrian ladder structure 8 is arranged in the left and right sections in the vertical direction, and a rest platform is arranged at the middle cross beam position. A safety guardrail is arranged outside the ladder structure 8 and connected to the steel pipe through a reinforcing connecting rod to avoid welding defects caused by insufficient contact area between the ladder structure 8 and the steel pipe that affect safety.

[0050] According to another aspect of the present application, a symmetrical construction method of a cable-stayed bridge steel tower with few supports is provided, using the above-mentioned cable-stayed bridge steel tower with few supports support structure, comprising the following steps:

[0051] The steel tower is divided into sections according to transportation conditions, hoisting adjustment and load conditions, and the diaphragms at both ends of each section are 0.5-1m away from the cutout. The sections include the left steel tower section 2, the right steel tower section 2, the steel tower middle beam section 7 and the steel tower top section 9;

[0052] The lower support columns 6 are fixed on the base 1, and the lower support columns 6 are arranged in two rows, and each row of lower support columns 6 is arranged with two;

[0053] Two cranes are used to symmetrically hoist the left steel tower segment 2 and the right steel tower segment 2 at the same time, and the left steel tower segment 2 and the right steel tower segment 2 are welded and fixed in sequence, and after the left steel tower segment 2 and the right steel tower segment 2 are welded and fixed, a transverse bracket 4 is erected, and a first end of the transverse bracket 4 is fixed to the left steel tower segment 2, and a second end is fixed to the right steel tower segment 2;

[0054] After the left steel tower segment 2 and the right steel tower segment 2 on both sides of the steel tower middle beam segment 7 are hoisted and welded, the steel tower middle beam segment 7 is hoisted and supported by the lower support column 6, and the two sides of the steel tower middle beam segment 7 are welded and fixed to the corresponding left steel tower segment 2 and the right steel tower segment 2;

[0055] An upper support column 10 is fixed at the upper end of the cross beam segment 7 in the steel tower. The upper support columns 10 are arranged in two rows, and each row of upper support columns 10 is arranged with two;

[0056] Two cranes are used to symmetrically hoist the remaining left steel tower segment 2, right steel tower segment 2 and steel tower top segment 9 at the same time, and a transverse support 4 is erected. The first end of the transverse support 4 is fixed to the left steel tower segment 2, and the second end is fixed to the right steel tower segment 2. The steel tower top segment 9 at the lowest end is supported by the upper support column 10, and the remaining steel tower top segments 9 are stacked and fixed in sequence.

[0057] Furthermore, the left steel tower segment 2 and the right steel tower segment 2 are provided with an annular platform 3 before hoisting. After the left steel tower segment 2 and the right steel tower segment 2 are welded and fixed, a transverse channel 5 is provided between the two annular platforms 3 for communication, and the transverse channel 5 is supported by a transverse bracket 4.

[0058] Before hoisting, the transverse support 14 and the longitudinal support 12 are fixedly installed on the inner side of the left steel tower segment 2, and the bolting member is fixedly installed on the inner side of the right steel tower segment 2. When the transverse support 4 is erected, the first end of the transverse support 4 is bolted and fixed to the bolting member, and the second end is erected on the transverse support 14 and contacts the longitudinal support 12.

[0059] A first set of ladder structures 8 is arranged between the base 1 and the middle cross beam segment 7 of the steel tower, and a second set of ladder structures 8 is arranged between the middle cross beam segment 7 of the steel tower and the top segment 9 of the steel tower. A full-length pedestrian ladder is arranged in left and right sections in the vertical direction, and a rest platform is arranged at the middle cross beam position. A safety guardrail is arranged outside the ladder and connected to the steel pipe through a reinforcing connecting rod to avoid welding defects caused by insufficient contact area between the ladder and the steel pipe to affect safety.

[0060] The above description is only the preferred embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Within the spirit and principle of the present application, any modification, equivalent replacement, improvement, etc. made shall be included in the protection scope of the present application.

Claims

1. A cable-stayed bridge steel tower with few brackets, characterized in that: include: The lower support column is arranged inside the steel tower, the lower end of the lower support column is fixed on the base, and the upper end of the lower support column is fixedly connected to the cross beam segment in the steel tower; The upper support column is arranged inside the steel tower, the lower end of the upper support column is fixed on the cross beam segment in the steel tower, and the upper end is used to support the top segment of the steel tower; A transverse support is arranged inside the steel tower, and two ends of the transverse support are respectively connected to the inner sides of adjacent steel tower segments; The cable-stayed bridge steel tower less-bracket support structure also includes a ladder structure connecting the base and the steel tower middle beam segment, and connecting the steel tower middle beam segment and the steel tower top segment; The cable-stayed bridge steel tower with few brackets also includes an annular platform arranged on the steel tower segment and a transverse channel connecting the annular platform. The annular platform is installed at the connection position of the steel tower segment to form an operating platform.

2. The cable-stayed bridge steel tower less-bracket support structure according to claim 1 is characterized in that: The lower support columns are arranged in two rows, and each row of lower support columns is arranged with two; The upper support columns are arranged in two rows, and each row of upper support columns is arranged with two.

3. The cable-stayed bridge steel tower less-bracket support structure according to claim 2 is characterized in that: The transverse supports are arranged in two groups and are distributed front to back, and the upper support columns and the lower support columns are located between the two groups of transverse supports.

4. The cable-stayed bridge steel tower less-bracket support structure according to claim 3 is characterized in that: The first end of the transverse bracket is bolted to the corresponding steel tower segment, and the second end is in abutment connection with the corresponding steel tower segment.

5. The cable-stayed bridge steel tower less-bracket support structure according to claim 4 is characterized in that: It also includes a transverse support member arranged on the inner side of the steel tower segment, and the second end of the transverse support is mounted on the transverse support member.

6. The cable-stayed bridge steel tower less-bracket support structure according to claim 5 is characterized in that: It also includes a longitudinal support member arranged inside the steel tower segment, wherein one side of the longitudinal support member is arranged as an inclined surface matching the inclination of the steel tower segment, and the other side is arranged as a vertical surface; The second end of the transverse bracket is connected to the vertical surface of the longitudinal support member.

7. The cable-stayed bridge steel tower less-bracket support structure according to claim 6 is characterized in that: The second end of the transverse support is provided with a buffer member, and the second end of the transverse support is connected to the vertical surface of the longitudinal support member through the buffer member.

8. The cable-stayed bridge steel tower less-bracket support structure according to claim 7 is characterized in that: A first load-bearing beam is disposed at the upper end of the lower support column, a second load-bearing beam is disposed at the upper end of the upper support column, and a diagonal brace is disposed between the second load-bearing beam and the upper support column; A support assembly for supporting the top segment of the steel tower is arranged at the upper end of the second load-bearing beam, and the support assembly has an arc-shaped support surface.

9. A method for symmetrically constructing a cable-stayed bridge steel tower with fewer supports, using the cable-stayed bridge steel tower with fewer supports support structure as claimed in any one of claims 1 to 8, characterized in that: The steps include: The steel tower is divided into sections according to transportation conditions, hoisting adjustment and load conditions, and the diaphragms at both ends of each section are 0.5-1m away from the cutout. The sections include the left steel tower section, the right steel tower section, the steel tower middle beam section and the steel tower top section; Fix the lower support columns on the base, and arrange the lower support columns in two rows, with two lower support columns in each row; Two cranes are used to symmetrically hoist the left steel tower segment and the right steel tower segment at the same time, and the left steel tower segment and the right steel tower segment are welded and fixed in turn, and a transverse bracket is set up after the left steel tower segment and the right steel tower segment are welded and fixed, and the first end of the transverse bracket is fixed to the left steel tower segment, and the second end is fixed to the right steel tower segment; After the left and right steel tower segments on both sides of the middle cross beam segment of the steel tower are hoisted and welded, the middle cross beam segment of the steel tower is hoisted and supported by the lower support columns, and the two sides of the middle cross beam segment of the steel tower are welded and fixed to the corresponding left and right steel tower segments; An upper support column is fixed at the upper end of the cross beam segment in the steel tower, and the upper support columns are arranged in two rows, with two upper support columns in each row; Two cranes are used to symmetrically lift the remaining left steel tower segments, right steel tower segments and steel tower top segments at the same time, and a transverse support is set up. The first end of the transverse support is fixed to the left steel tower segment, and the second end is fixed to the right steel tower segment. The steel tower top segment at the lowest end is supported by the upper support columns, and the remaining steel tower top segments are stacked and fixed in sequence.

10. The symmetrical construction method of cable-stayed bridge steel tower with few supports according to claim 9 is characterized in that: The left steel tower segment and the right steel tower segment are provided with an annular platform before hoisting. After the left steel tower segment and the right steel tower segment are welded and fixed, a transverse channel is provided between the two annular platforms for communication, and the transverse channel is supported by a transverse bracket. Before hoisting, a transverse support and a longitudinal support are fixedly installed on the inner side of the left steel tower segment, and a bolting member is fixedly installed on the inner side of the right steel tower segment. When erecting a transverse support, a first end of the transverse support is bolted and fixed to the bolting member, and a second end is erected on the transverse support and contacts the longitudinal support; A first set of ladder structures is arranged between the base and the cross beam section in the steel tower, and a second set of ladder structures is arranged between the cross beam section in the steel tower and the top section of the steel tower.

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